The utility model relates to an explosive existing field test device of mist, the sampling hose loops through explosion -proof sampling pump, spark arrester I, it is connected with the one end of explosion cavity to block valve I, the other end of explosion cavity is connected with spark arrester II and rupture disk through an interface of many interface converting flange in proper order, anotherinterface of many interface converting flange is connected with spark arrester III through blocking valve II, high -speed data collection storage module is connected with high -speed pressure sensor and the high -speed temperature sensor who sets up in the explosion cavity respectively through high -speed pressure sensor and high -speed temperature sensor, intelligent control and data acquisitionanalysis system pass through wireless data communication module I can realize long -range wireless control with wireless data communication module II, multichannel drive module and the platinum ignition wire who sets up in the explosion cavity are connected. The utility model discloses the explosive gas atmosphere scene is can be used to, the automatic gas sampling and the explosive test verdict of on -the -spot mist can be realized.