The utility model discloses a prevent gusher device. This prevent gusher device includes: wellhead assembly, wellhead assembly include barrel and shutoff piece, and the shutoff piece can be sealed with the one end of barrel, connecting rod, connecting rod are worn to establish on the shutoff piece, and when the shutoff piece was connected with the barrel, the one end of connecting rod can stretch into in the barrel. The utility model discloses a prevent that the blowout device includes that the internal diameter satisfies the barrel that the special actuating lever of screw pump and pole centralizer can pass through smoothly for operating personnel does not need frequent flip -chip well head when the lower beam centralizer, reduced workman's intensity of labour when having reduced operating time yet. Simultaneously, prevent gusher device still includes shutoff piece and connecting rod, and when taking place the blowout omen, operating personnel can install the shutoff piece in the upper end of barrel, and then seals the barrel, has prevented the emergence of blowout.