An electrical connection box comprises a base cover (1) having a plurality of first openings in both sides thereof; a top cover (8) having a plurality of second openings in both sides thereof; a main PCB board (3); an input DC socket (4) located on said PCB board; a plurality of output DC sockets (5) located on said PCB board; a plurality of short circuit protectors (6) located on said PCB board, each said protector connecting each said output DC socket in parallel; a thermal protector (7) located on said PCB board; and a heat transmitter (2) covering on said input DC socket, output DC sockets, short circuit protectors and thermal protector; wherein said heat transmitter concentratively transfers the heat of said input DC socket, output DC sockets, short circuit protectors to said thermal protector; and wherein said main PCB board, input DC socket, output DC sockets, short circuit protectors and thermal protector are arranged between said base cover and top cover.