Energy-saving brake reliable in operation

The invention discloses an energy-saving brake reliable in operation. The brake comprises a band-type brake, an electric hydraulic cylinder and a locking and unlocking mechanism, the electric hydraulic cylinder and the locking and unlocking mechanism are connected with a control circuit, the hydraulic cylinder is mounted on a base of the band-type brake, an ejector rod of the hydraulic cylinder isopposite to an operating lever at the upper portion of the band-type brake, and the locking and unlocking mechanism comprises a locking plate, a locking spring and a tripping electromagnet. One end of the locking plate is rotationally connected with the base of the band-type brake and provided with the locking spring, the locking plate is made to abut against the swing end of the operating leverthrough elastic force of the locking spring, a clamping groove corresponding to the jacked swing end of the operating lever is formed in the locking plate, and the tripping electromagnet is fixed to the operating lever of the