Elevator brake release device and system

The embodiment of the invention discloses an elevator brake-releasing device and system.The elevator brake-releasing device comprises an interface module, a brake-releasing operation module and a connecting wire, the brake-releasing operation module is provided with a brake-releasing loop of a brake-releasing button, the interface module comprises a first interface and a second interface, and a control module and the brake-releasing operation module are both connected with the interface module; when the band-type brake power supply module is connected with the first interface through the connecting line, the safety circuit of the control module is connected with the safety circuit input port of the band-type brake power supply module; when the band-type brake power supply module is connected with the second interface through the connecting line, the brake release loop is connected with the safety loop input port of the band-type brake power supply module, when the brake release button is pressed down, the ban