The invention belongs to the technical field of vegetable cultivation and discloses a method for increasing winter tomato yield and quality of a sunlight greenhouse.The method includes: a heating device is arranged to rise the temperature during the cultivation of tomatoes, and the temperature of a position 10cm away from the earth surface is controlled to be 17-22 DEG C; during sunny weather, the temperature rising is started at 8:30-9:00 and ended at 12:30-13:00; during unsunny weather, the temperature rising is started when a heat preservation quilt is opened if the heat preservation quilt covering the greenhouse is opened, or else the temperature rising is not performed; the temperature environment of the root systems of the tomatoes is not regulated manually in other time, except the 4-4.5 hours of the temperature rising, of the day, and the root systems of the tomatoes are allowed to naturally change along with the temperature drop of the sunlight greenhouse.By the method, the yield of quality of the tomatoes can be increased, and the VC content, yield per panicle, single-fruit mass and size and fruit sugar-acid ratio of the tomatoes are increased.