"There is a growing concern that Warner's thuggish behaviour has gone too far," Crowe wrote.
"Soon, one day, it will lead to an incident that will sully the game for good."
Crowe pointed out former Australian captain Ian Chappell had said a player will get punched on a field.
"Warner may just be the one who gets pinned by someone in retaliation, and if it is him who gets hammered, it will be overdue, if wrong."
Crowe was in favour of umpires being armed with red and yellow cards to dish out to unruly players, and proposed six-month bans for players.
"Warner can play, but he is the most juvenile cricketer I have seen on a field. I don't care how good he is; if he continues to show all those watching that he doesn't care, he must be removed, either by Cricket Australia or definitely by the world governing body.
"The more he gets away with it, the more others will follow his pitiful actions."
Other players' poor behaviour had caught Crowe's attention, but the combative Australian opener "is the worst culprit", he wrote.
"If chuckers and match fixers are shown the door, then so too must verbal abusers be."
Crowe's concern related to the next generation of young players, who watch their heroes and imitate their behaviour.
"In their young, impressionable minds, they think they are copying a hero. On the contrary, they are idolising a player who seems determined to bring down the gentleman's game."
Crowe called for a six-month ban if a player was issued two yellow cards within a certain period. That's not happening, but Warner has been given time to cool his heels and consider his future.
"It's the only way to kill a hornet's nest and get this game back in a groove of respect," Crowe wrote.
In his 77-test career, Crowe, among the game's most elegant and imposing batsmen in his prime, scored 5444 runs at 45.36. His New Zealand record 17 test centuries was overtaken by current national captain Kane Williamson in New Zealand's first pink ball test at Eden Park against England last month.
Memorabilia up for auction
Russell Crowe is auctioning off a slew of personal items tonight at a Sydney auction - including memorabilia from his cousin Martin Crowe's cricketing career.
The 277-strong collection, which includes 30 items of Martin's, will go under the hammer at Sotheby's Australia at 8pm.
Money from Martin's items will be donated to the late cricketer's daughter, Emma, a representative for his widow Lorraine Downes confirmed.
Called "The Art of Divorce", Crowe has said the auction was "cathartic", and a way to "create space for the future".
Sotheby's estimates it could be worth around $3.8 million.
The auction's date marks Crowe's 54th birthday and his wedding anniversary, as he prepares to divorce his estranged wife Danielle Spencer. The pair have been separated five years.
Items of Martin's include the bats he used to make his 17th and last test century and his second century at Lord's.
"Considerable attention has been seen from New Zealand, Australia and internationally in relation to Martin Crowe's sporting memorabilia," Sotheby's Australia senior executive officer John Keats said.
