The utility model discloses an orchard garden grass chopper. A fixed tool and a suppression roller are arranged on the front part of a frame; a rotary grass cutting tool is arranged on the frame through a shaft and a tool wheel; the tool wheel is in transmission connection with a belt pulley arranged on the upper part of the frame through a belt; the belt pulley is arranged on a power shaft of a reversing box, and is in transmission connection with the power output shaft of a power machine; and a traction frame is arranged on the back part of the frame. The orchard garden grass chopper can be used for cutting weeds or planted grass which are higher than the ground in a way of keeping the roots of grass, so that the ground ecological environment of an orchard garden is not damaged, grass can be turned into organic matters and fertilizers, the recovery and maintaining of the orchard garden ecological environment are facilitated, the grass is turned into the organic matters and the fertilizers, and a positive effect is achieved. The orchard garden grass chopper is suitable to be taken as an orchard garden farming machine.