Gas chromatograph-mass spectrometer

The invention relates to the technical field of environmental protection, and further discloses a gas chromatograph-mass spectrometer. The spectrometer comprises a combined instrument body, a dustproof cover is arranged at the bottom of the sample detector; a door body is mounted on the surface of the dustproof cover at the slot through a hinge shaft; a limiting piece is mounted at the front end of the surface of the door body; and a clamping piece is installed on the surface of the dust cover on one side of the open groove, a clamping groove is formed in the surface of the clamping piece, a second hydraulic cylinder is installed in the combination instrument body, a fixing rod is installed at the output end of the second hydraulic cylinder through a piston rod, and supporting rods are symmetrically installed at the bottom of the fixing rod. According to the gas chromatograph-mass spectrometer, the dustproof cover, the clamping groove, the limiting block, the second hydraulic cylinderand the supporting rod ar