The SFC series explosion-proof gas filling box adopts a double-layer structure: the outer box is made of 5mm steel plate; the two adjacent carbon fiber bottles in the inner box are placed separately (except SFC1), separated by 4mm steel plate in the middle, 4mm steel plate in the front, and 5mm steel plate in the door. The thickness of the steel plate between the explosion-proof gas filling box and the operator is 9mm, so that the safety of the operator can be fully guaranteed.