The invention relates to a small transport vehicle, especially a hydraulic service vehicle specially used for loading, unloading and transporting power distribution circuit breakers, including a door frame, a hydraulic system, a boom, and a vehicle frame, and the door frame matches and moves with the boom Connection, the door frame is fixedly connected with the frame, the frame is equipped with two directional wheels and two universal wheels, the hydraulic system is equipped with a rising pedal, a fuel tank, a lifting cylinder, a descending pedal, the fuel tank is connected with the frame, and the lifting cylinder It is connected with the boom, and the boom is provided with a boom frame, a connecting unlocking device and a positioning locking device. The connecting unlocking device is installed on the two inner sides of the boom frame, and the positioning locking device is installed on the outside of the boom frame. The present invention has a reasonable structural design, and has the characteristics of being movable and lifting. The connection unlocking device ensures the connection locking between the present invention and the switch cabinet, and the positioning locking device ensures the locking between the present invention and the short circuit, and the connection unlocking device and the positioning locking device exist The interlocking relationship makes the short circuit breaker safe and reliable during loading and unloading and transportation, and the lifting is stable, the rotation is flexible, and the operation is convenient, which is conducive to reducing labor intensity, improving production efficiency, and realizing safe loading and unloading.