The invention discloses an improved power supply plugging seat device. The device comprises a plugging seat body fixedly installed in a wall body and a plugging head body connected with an electricalappliance. Insertion grooves with rightwards openings are up-down symmetrically arranged in the plugging seat body. Conductive sheets connected with the municipal power are installed in upper and lower end walls of the insertion grooves. Sliding cavities are arranged on left ends of the insertion grooves. Sliding frames are left-right slidably installed in the sliding cavities. Connection groovesequipped with rightward openings and connected with the insertion grooves are arranged in the sliding frames. Through grooves are arranged in the left end walls of the connection grooves. Sliding grooves with openings towards the connection grooves are up-down symmetrically arranged in the sliding frames. Contact switches used for controlling electrification of the conductive sheets are fixedly installed on ends, away from the connection grooves, of the sliding grooves. Sliding blocks are slidably installed in the sliding grooves. Power supply insertion rods cooperating with the insertion grooves are up-down symmetrically installed on left end face of the plugging head body. Left-right connection rectangular grooves are arranged in the power supply insertion grooves. The right ends of therectangular grooves penetrate through the plugging head body. Up-down penetrating telescoping grooves communicating with the rectangular grooves are arranged in the power supply insertion rods.