The invention discloses a reinforced residual current protection simulation practical training cabinet. The practical training cabinet comprises a cabinet body, a bottom plate and a CPCI connector are arranged in the cabinet body, and an indicating instrument panel is arranged on the front face of the cabinet body; the bottom plate is arranged on the back face of the cabinet body, the CPCI connector is arranged on the bottom plate and comprises a CPCI plug and a CPCI socket, the CPCI plug is arranged on the bottom plate, and the CPCI socket is connected with the indicating instrument panel; a three-level residual current action protection simulation practical training module is arranged on the bottom plate, and the bottom plate is connected with a three-phase power source through a movable power plug. The CPCI connector is adopted between the bottom plate and the indicating instrument panel to replace a traditional cable bundle welding mode, the space in the cabinet body is saved, and the interior structure of the cabinet body is more steady.