Normally-closed hydraulic brake

The invention discloses a normally-closed hydraulic brake. The normally-closed hydraulic brake comprises a base fixing plate, two guide poles, a first brake pad carrier, a second brake pad carrier, a first brake pad, a second brake pad, a reset spring and a brake cylinder component. The two guide poles are vertically mounted on the base fixing plate. The first brake pad carrier sleeves the two guide poles. The first brake pad is mounted on the first brake pad carrier. The brake cylinder component comprises a hydraulic cylinder, a piston rod and a plurality of disc springs. A cover plate is arranged at the top of the hydraulic cylinder. The disc springs are compressed in the hydraulic cylinder by the cover plate. A joint communicated with the bottom of an inner cavity of the hydraulic cylinder is arranged on the lateral side of the hydraulic cylinder. A top plate is arranged at the upper end of the piston rod and is connected with the second brake pad carrier through a push rod. The second brake pad is mounted on the face, opposite to the first brake pad carrier, of the second brake pad carrier. The upper end of the reset spring is connected with a guide pole connecting plate, and the lower end of the reset spring is connected with the brake cylinder component. The normally-closed hydraulic brake is simple and compact in structure, convenient to operate and easy to control and produce.