The utility model provides a motor vehicle blast pipe fire prevention cap connects, includes: connecting pipe, gasket, coulisse, clamp plate, bolt. Motor vehicle blast pipe fire prevention cap connects is equipped with six gaskets, the end of gasket is equipped with the pin, insert respectively in six rectangle button head sliding trays of coulisse, the left end of connecting pipe is equipped with the flange, be equipped with two ear handle with the symmetry that makes progress in week of flange coplanar, the last connecting hole that is equipped with of ear handle, the symmetry is equipped with four fixed orificess on the flange in ear handle, same four fixed orificess that are equipped with the symmetry on the coulisse, pass the fixed orifices with connecting pipe and coulisse hookup through the screw, the annular clamp plate is equipped with two ear handle with the connecting pipe flange is equally symmetrical, the last connecting hole that is equipped with of ear handle, the bolt passes the connecting hole, with connecting pipe and clamp plate hookup. The utility model is suitable for a blast pipe of various vehicles and being connected of motor vehicle blast pipe fire prevention cap, the installation is dismantled conveniently, and is sealed effectual, reaches the purpose of fire prevention, the safety in production of guarantee oil field station storehouse.