Disclosed is a pile driver for gardens. Two handles are connected on the left and right of an upper frame and a lower frame, an air cylinder is assembled in the middle of the pile driver, a casing is connected to the lower end of the pile driver, a lifting ring is mounted on the upper frame, an engine is mounted between the upper frame, the left-side handle and the air cylinder, a gear case is mounted at the upper end of the air cylinder, an engine stop switch, a handle switch and an accelerator are mounted on the right-side handle, the engine is connected with a transmission shaft which is sequentially connected with a crankshaft, a connecting rod and a piston, the crankshaft, the connecting rod and the piston are located in the air cylinder, the casing is mounted at the lower end of the air cylinder, a blow hammer is located between the casing and the piston and can move up and down, and the casing is hollow to have a pile accommodated. The pile driver is used in the gardens for requirements on pile anchoring and can automatically drive to anchor the pile through operation by one person, the operation is easy and efficient, and the pile driver is free of affect of cross section size of the pile and soil soft degree in pile anchoring sections.