Fastener with visual pre-tightening force

The invention belongs to the technical field of fasteners, and particularly relates to a pre-tightening force visualized fastener which comprises a threaded part, an end part, a fixed plate, a movable column, a rotating plate, a sealing plate and an indicating part. During use, a part is in contact with an extrusion gasket, so that a movable column moves, the volume of a liquid cavity is reduced, the pressure in the liquid cavity is increased, a movable plate rotates, the movable plate extrudes a cavity filled with gas, the gas is compressed, and the pressure in the gas is kept consistent with the pressure in the liquid cavity; meanwhile, the pressure is consistent with the pressure acted on the movable column by the liquid cavity; due to the fact that the indicating device is arranged on one side of the sealing plate, along with rotation of the rotating plate, the indicating device can display the pressure condition in the cavity in real time, can display the pressure borne by the piston column in real time,