General protective casing

The utility model provides a general protective casing which comprises a main body, an upper lid assembled on the main body, and lateral plates mounted on two sides of the main body. The main body and the upper lid are sealed through sealing pieces, a plurality of grooves are formed on the surface of the main body, and a plurality of slots are formed on the surface of the upper lid. In the general protective casing provided by the utility model, the plurality of grooves and slots are formed on the surface, so that heat generated by the power dissipation of a switching power supply, a power tube, an output rectifier tube, a transformer, and other main power devices in the protective casing can be transmitted to the outside through a natural cooling manner of the protective casing, solving the temperature rise problem easily.