The invention discloses a mountain ecological re-greening plant transplanting device. The mountain ecological re-greening plant transplanting device comprises a frame body, and the frame body is provided with a horizontally arranged mounting casing pipe, a cross rod fixedly arranged in a cross rod in the mounting casing pipe in a penetrated mode, two clamping jaws which are hinged to the cross rod and used for clamping nursery stocks, a first driving mechanism used for driving the clamping jaws to rotate, a second driving mechanism used for driving the mounting casing pipe to move upwards in the vertical direction and a third driving mechanism used for driving the cross rod to rotate. The mountain ecological re-greening plant transplanting device is simple in structure and very convenient to operate, can be used for transplanting the mountain nursery stocks, lower the labor intensity of workers and improve the work efficiency.