Oil filling box

The utility model relates to a filler box, comprising a bulk of the filler box and a box lid. A unfold equipment is positioned at the joint of the bulk and the box lid. A combined switch is positioned at the edge of the bulk. The combined switch comprises a sleeve, a combination spring, a protection sleeve, a fixture screw and a fixture pole. The combination spring is arranged in the sleeve. The fixture screw is arranged at the end of the combination spring. The protection sleeve is arranged at the exterior of the fixture pole at the same time. The utility model has the advantages of simple structure, low cost, long service life and good reliability by combining the unfold equipment and combination spring to control the switch of the filler box.