Auxiliary device for construction engineering cost budgeting

The auxiliary device comprises a portable box and pulling plates installed on the surfaces of the two sides of the portable box, a containing groove is formed in the surface of the bottom end of the portable box, a sliding plate is arranged in the groove in a sliding mode, a limiting rod is fixedly arranged on the surface of one end of the sliding plate, and the limiting rod is arranged on the surface of the other end of the sliding plate. And one end of each limiting rod is inserted into the surface of the corresponding placement groove in a penetrating mode, a threaded rod is rotationally arranged on the inner wall of the pulling plate, the surface of each threaded rod is sleeved with a threaded sleeve, sliding grooves are formed in the surfaces of the two sides of the portable box, wood plates are arranged in the sliding grooves in a sliding mode, and connecting rods are fixedly arranged on the surfaces of one sides of the wood plates. According to the portable drawing box, by pulling the handle downwards,