The invention discloses a switch cabinet valve mechanism, comprising an upper valve, a lower valve, a pair of guide bars, a pair of upper door tie bars, a pair of lower door tie bars, a pair of torsion springs, a pair of upper door pull arms, a pair of lower door pull arms, a pair of fixing shafts and a pair of fixing seats; Two guide rods are respectively arranged at parallel intervals, two endsof the upper valve and two ends of the lower valve are respectively movably sleeved on each guide rod, one end of the two upper valve pull rods is respectively hinged with one end of the upper valve,and the other end is respectively hinged with the front end of an upper valve pull arm; One end of the two lower door tie rods is respectively hinged with one end of the lower valve, and the other endis respectively hinged with the front end of a lower door pull arm; The fixing seat is fixedly arranged; The rear end of the upper door pulling arm and the rear end of the lower door pulling arm areboth rotatably connected with the same fixing shaft which is fixedly installed on a fixing seat; The torsion springs are respectively fitted on a fixed shaft and connected with an upper door pulling arm and a lower door pulling arm. The invention has the beneficial effect of being able to automatically reset.