The invention provides an automatic auxiliary bench for machining with automatic control of the jacking force, including: clamping parts, receiving parts, triggering parts, moving bins, motors, telescopic parts, splints, force-bearing parts, contact blocks, and trigger blocks and the pressure plate; the inner right side of the moving compartment is equipped with a motor through a connecting piece, and the bottom of the motor is equipped with a gear through a transmission shaft, and the left side of the splint is installed with a rubber material with an arc-shaped structure on the left side by bonding. Anti-slip mat, and the bottom of the telescopic part is equipped with a pulley through the connecting part and the rotating shaft; the spring plate here is used to be pulled by the moving part, so that the spring plate can be in different bending arcs, so that it is convenient to carry out parts with arcs. Fixing, so that the parts with arc structure can be firmly fixed, and the chuck is used to drive the spring plate for installation, so that the spring plate can be connected with the moving part and the installation block through the chuck.