Brake device with self-adaptive brake pad

The invention discloses a brake device with a self-adaptive brake pad, which comprises a fixing assembly comprising a base, a brake disc and a hydraulic connecting pipe, a brake assembly arranged in the fixing assembly and comprising a brake pad, a connecting plate and a limiting transverse column, and a compensation assembly arranged between the fixing assembly and the brake assembly, comprising a limiting piece, a second piston and a third piston. According to the device, under the cooperation of the fixing assembly, the braking assembly and the compensation assembly, it can be guaranteed that the brake pad can be automatically compensated according to the abrasion loss, the stroke of hydraulic or mechanical force cannot be increased along with abrasion of the brake pad during braking every time, and therefore the braking effect is greatly improved; the effect of the brake device cannot be reduced along with abrasion of the brake pad, and the later brake effect is greatly improved within the working time li