The invention discloses a pruning accessory tool used in cooperation with a movable vehicle. The accessory tool comprises: a connecting base, a bottom rotating mechanism, a driving mechanism, a head rotating mechanism, a working assembly, and a control system. The lower end of the connecting base is connected to a movable vehicle; the upper end of the connecting base is connected with the bottom rotating mechanism, wherein the upper end of the bottom rotating mechanism is fixedly connected with the rear end of the driving mechanism, and the front end of the driving mechanism is fixedly connected with one end of the head rotating mechanism. The working assembly comprises a tool rest, cutter heads, and a power device, wherein the tool rest is fixedly connected with the rotating mechanism, one end of the power device is arranged on the tool rest, the cutter heads are assembled at the other end of the power device, and the cutter heads are distributed on different planes. The pruning accessory tool can prune a left plane, a right plane, and an upper plane of a green belt and a wattled wall, so that all the pruned planes are located on the same plane with an aesthetically pleasing effect.