The utility model discloses a blowout device which comprises a waste liquid box made of steel and fireproof plates. The waste liquid box is a storage box body with the sealed periphery. A female union, a cleaning hole, a quick coupler and a pipeline seat are arranged on the waste liquid box. The pipeline seat is arranged on the top of one end of the waste liquid box. The fireproof plates are three in number, the two side-face fireproof plates are assembled on the two sides of the top of the waste liquid box through hinge buckles respectively, and the front-face fireproof plate is assembled at the ends, away from the pipeline seat, of the two side-face fireproof plates through elastic movable buckles. The front-face fireproof plate and the pipeline seat are arranged at the two ends of the top of the waste liquid box respectively, and the three fireproof plates form a groove-shaped blowout tank in the top of the waste liquid box. The blowout device ensures that the blowout device has the good leakage preventing, heat resisting and erosion resisting characteristics and can be moved conveniently and repeatedly used, and therefore the blowout device reduces oil and gas production cost and is environmentally-friendly, reliable and long in service life.