Sealed explosion-proof electrical cabinet

The invention discloses a sealed explosion-proof electrical cabinet. The cabinet comprises a cabinet body (1) and a pressure relief device (2) arranged at the top end of the cabinet body (1), and is characterized in that the pressure relief device (2) comprises a pressure relief opening (3) formed in the top of the cabinet body (1), a pressure relief cylinder (13) arranged at the top of the cabinet body (1), and an upper cover (9) movably buckled at the upper end of the pressure relief cylinder (13). The lower end of the cover wall of the upper cover is lower than the pressure relief opening, and one end, far away from the center of the pressure relief cylinder, of the pressure relief opening is inclined downwards, so that rainwater can be effectively prevented from entering the pressure relief cylinder and further entering the cabinet body. By arranging a sealing plate, external mosquitoes can be prevented from entering the pressure relief cylinder from the pressure relief opening and then entering the cabin