The utility model discloses a winter construction cantilever heat preservation greenhouse, including setting up the end envelope and the longeron of setting at the continuous beam top in the continuous beam lower part, the top of longeron be connected with the canopy lid, canopy lid and end envelope between the front side and the rear side in region all be equipped with preceding envelope, canopy lid and end envelope between regional left side and right side all be equipped with the envelope that inclines, end envelope on be equipped with the fireproof rock cotton quilt. The utility model discloses it is simple to have processing, and the practicality is strong, has practiced thrift a large amount of manpower and materials, the utility model discloses a calculate, can resist 10 grades of strong wind, satisfy in the northwest's construction demand, the utility model provides a big section cantilever concreting winter construction safety of strong wind severe cold district, quality the difficult problem guaranteed is difficult to, avoided other materials pre -buried in the concrete concrete leakiness and the not enough drawback of office's intensity.