The invention discloses a tillage device for a greenhouse. The tillage device comprises a motor, a steel wire cable twisted rope roller, steel wire cable twisted ropes, a compound tillage machine and a guide rail, wherein the compound tillage machine is provided with depth wheels, the motor is connected with the steel wire cable twisted rope roller through keys, one end of each steel wire cable twisted rope is fixed to the steel wire cable twisted rope roller, and the other end of each steel wire cable twisted rope is connected with the compound tillage machine through a hook, the guide rail is arranged in the middle of the length direction of the greenhouse, the motor and the compound tillage machine can move on the guide rail, and the working positions of the steel wire cable twisted ropes are located in the middle of the greenhouse. By means of the tillage device, tillage can be conducted in the mode that electric energy is used as the direct drive of an energy source, automation control is achieved, the mechanical structure is simplified, and the manufacturing cost is reduced. Meanwhile, the problems that soil is compacted due to tractor tillage, and vegetables in the greenhouse are polluted due to the harmful gas discharged by a diesel engine are avoided; it can be achieved that tillage in the greenhouse is completed one time, and the problems that when land cultivation work is conducted by using a tractor, the tractor inconveniently makes a turn and boundary regions cannot cultivated are avoided.