Protection device of prefabricated substation

The utility model discloses a protection device of a prefabricated substation. The protection device comprises a cabinet body, a fire extinguisher, a controller and a storage battery, the cabinet body is of a square box structure, and a first partition plate and a second partition plate are vertically and symmetrically arranged on the two sides of an inner cavity. An air inlet cavity is formed between the first partition plate and the cabinet body left side plate, and an air outlet cavity is formed between the second partition plate and the cabinet body right side plate; vent holes are formed in the first partition plate and the second partition plate, an air channel is formed in the outer side of the first partition plate, and a connecting pipe is arranged below the air channel; a plurality of storage plates are horizontally arranged between the first partition plate and the second partition plate; the fire extinguisher, the controller and the storage battery are installed at the bottom of the cabinet body.