Volunteers have pre-prepared 240kg chicken and 300kg of ham and 700kg of various vegetables and for dessert, guests will be served jelly, ice-cream and other festive fare.
On Christmas Eve, volunteer head chef Stephen Coffey, an assistant chef, and about 20 volunteer helpers will start preparations for the meal, before adding the final touches on Christmas Day.
On Christmas Day an estimated 700 volunteers will help decorate the venue, prepare and cook the lunch, serve meals, and clean up.
There would also be entertainment and a visit from Santa on the day
Ms Robertson said Christmas was always the mission's busiest time of year.
"We are always overwhelmed by the level of need we see at this time of the year. However with the support of the community, through donations and volunteering we are able to meet this need.
"This year has been incredibly tough but the community has come behind us. I would like to thank each and every volunteer for their help and all the people who have donated to make Christmas special for everyone in our community."
Since the beginning of December, the City Mission has distributed emergency food parcels to hundreds of families in need.
At least 7000 gifts have also been distributed to families, so every child has a present to open on Christmas Day.
The mission also provided gifts to other Auckland community groups to distribute to the families they work with.
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Auckland City Mission's Christmas lunch menu:
Main course:
240kg of chicken with gravy
300kg of ham
240kg gourmet potatoes
240kg roast kumara
60kg beans
60kg carrots
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Dessert:
400 litres of ice-cream
100 litres of fruit
150 litres of jelly
2500 slices of Christmas cake
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Decorations:
210 tablecloths
1000 balloons
2500 christmas crackers
2500 presents on the day
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Extras:
3000 bags of lollies
3000 bars of chocolate
6000 bottles of soft drink
2500 Christmas tree cookies
1000 cakes