Rack type oil cylinder transmission device with stroke positioning function

The utility model discloses a rack type oil cylinder transmission device with stroke positioning, which comprises a transmission box body and an oil cylinder arranged on the transmission box body, the oil cylinder is provided with a piston rod positioned in the transmission box body, the piston rod is connected with a rack, the rack is meshed with a gear, the gear is fixed at the end part of a valve shaft, and the valve shaft is connected with the piston rod. A stroke output rod is arranged at the end, away from the oil cylinder, of the rack, the stroke output rod extends out of the transmission box body and reciprocates under the action of the piston rod, the part, located outside the transmission box body, of the stroke output rod is movably connected with a positioning ring, and the positioning ring can move in the axial direction of the stroke output rod. After the stroke output rod ends the stroke, the positioning ring is adjusted to the position of the transmission box body and is fixedly connected with