The invention relates to a tree planting device, and particularly relates to a large-scale tree planting device for gardens. The technical problem to be solved by the invention is to provide a large-scale tree planting device for gardens. The invention provides the large-sized tree planting device for gardens. The device comprises a vehicle plate, vehicle feet, vehicle wheels, a support frame, a swinging rod, a first air cylinder, a first motor, a U-shaped frame, a mounting block, a tooth-lacked gear, a circular wooden clamp and the like; the front, rear, left and right sides of the bottom ofthe vehicle plate are all provided with one vehicle foot; the bottom of each of the four vehicle feet is rotatably connected with one vehicle wheel; the upper part of the vehicle plate is obliquely and fixedly connected with the support frame; the top of the support frame is rotatably connected with the swinging rod; and the lower part of the front side of the support frame is rotatably connectedwith the first air cylinder. The device provided by the invention realizes the function of professionally and rapidly planting large trees, realizes the function of preventing fertilizer and water deposition, and realizes the function of sprinkling fertilizers and water on trees. In addition, the device has the characteristics of saving manpower, saving financial resources, fast tree planting speed, high professional degree and the like.