The invention relates to a fertilizing, spraying, ridging and full-filming machine for potato. The machine which comprises a frame, a speed changer, a fertilizing assembly, a spraying assembly, a ridging plough, a filming assembly and an upper soil conveying apparatus is characterized in that: a lower support of the fertilizing assembly is arranged above the center of the front part of the frame, the speed changer is arranged behind the lower support, the front end of the speed changer is connected with external power through a crossed universal transmission shaft, and one side of the speed changer is provided with a sprocket wheel for outputting power of the speed changer; and the sprocket wheel transmits the power to make all parts of the machine to run. The machine of the invention, which integrates ditching, ridging, fertilizing, spraying, filming and film side soil casing together, allows artificial time and labor consuming operations of soil working, fertilizing, spraying and the like before filming to be mechanized, the production efficiency to be greatly improved, and the ridge shape to be uniform by adding a ridge shaper, so films are tightly clung to ridges, and present disadvantages of loose film connection, film damage, film tearing, severe cracking and the like are overcome. Experiment determinations show that the machine allows 0.33-0.4 hectares of soil to be filmed each hour, so the work efficiency of the machine is about six times higher than the manual work efficiency.