Simple protection device for mortar covering prevention of junction box

The utility model provides a simple protection device for preventing mortar from covering a junction box. A junction box belongs to the technical field of constructional engineering and structurally comprises a junction box body, a middle body and a rear sealing body are arranged at a box opening of the junction box body, the rear sealing body is formed by fixedly connecting a rear cover plate andan embedded block, the middle body is formed by fixedly connecting a frame plate and two wedge blocks, and a rear cover plate front mounting surface of the rear sealing body is attached to a rear mounting surface of the frame plate of the middle body. The wedge-shaped block above the square hole, the embedded block and the wedge-shaped block below the square hole which are fixedly connected are embedded into the inner cavity of the junction box together; the front mounting surface of the frame plate is buckled with the box opening of the junction box; and the screw holes of the box opening screw seats of the junction