Internal installation structure of vehicle-mounted charger

The invention relates to the technical field of vehicle-mounted chargers, in particular to a vehicle-mounted charger internal installation structure which comprises a charger box body, positioning plates, positioning grooves, a circuit board, a positioning frame, first sliding grooves, first sliding blocks and fixing blocks, and the positioning plates are fixedly installed at the four corners of the interior of the charger box body at equal intervals; a positioning groove is formed in one corner, away from the charger box body, of the positioning plate, and a circuit board is installed among the four positioning grooves. When the charger is used, the circuit board is installed among the four positioning grooves, the position of the circuit board is positioned through the positioning grooves, and the circuit board is extruded through the fixing blocks, so that the circuit board is fixed; the fixation of the circuit board by a bolt in the prior art is canceled, and rust between the bolt and the circuit board in