The invention belongs to the technical field of culture of potato, and particularly discloses a cost-saving and yield-increasing culture technique for southern winter planting potato. The technique comprises the following steps of: selecting a land, preparing the land and furrowing; applying a base fertilizer; treating potato seeds; seeding; covering with soil; covering with a film; earthing up the film; managing liquid manure, weeds and insect pests; and harvesting, wherein a method of earthing up the film is that: a layer of smashed soil of 5-8 centimeters is covered on the film by using a machine or a hoe, so that the film on a ridge surface is covered fully. In the technique, an integral water manure furrow application method is used innovatively, so that the labor per acre is saved by 7 persons, and the acre yield is up to 9,136 jin. Due to the adoption of the technique, the increase in of the yield of potato is facilitated, the production cost is lowered, and the economic benefit of potato production is increased. On the aspect of technique, the process flow of potato production is completed, the production time of potato is shortened, and a solid technical foundation is laid for the popularizing scale, standardization and commercial production of the potato industry.