The utility model belongs to the technical field of machine design, concretely relates to engine running support thrust automatic loading device. The device includes weight, lever, pull rod, lead screw, pull rod one end installation weight, the other end and lever connection, the lead screw suit is on the pull rod, it improves the part: be provided with the drive arrangement that the rotation of ability drive screw becomes to making the pull rod to reciprocate on the lead screw, drive arrangement includes box, transmission structure, feather key and motor, drive mechanism sets up in the box, drive mechanism includes intermeshing's worm wheel, worm, the motor is installed outside the box, feather key fixed mounting is outside the box, the output shaft of worm and motor, and the worm engages with the worm gear. The worm wheel is installed on the lead screw, set up flutedly on the lead screw, feather key one end clamps in the recess. The device not only degree of automation high but also can improve pretightning force and loading efficiency greatly.