The invention discloses a high precision gatage limiting device. The high precision gatage limiting device comprises a shell, and an input shaft, an absolute value encoder, a driving gear, a driven gear, a transmission screw, a sliding rod guide rail, a sliding block and a limiting switch which are arranged in the shell; the outer end of the input shaft is fixedly connected with a power output shaft of a winding hoist, and the inner end of the input shaft is connected with the absolute value encoder; and the driving gear flexibly sleeves the output shaft, the driven gear flexibly sleeves the transmission screw, the driving gear and the driven gear are engaged with each other, the sliding block sleeves the sliding rod guide rail, and the sliding block is fixedly connected with a screw sliding block on the transmission screw, and the limiting switch matched with the sliding block in contact is fixedly arranged on the side part of the sliding rod guide rail in the shell, namely when the sliding block overlaps with the upper part and the lower part of the limiting switch, a pressing handle of the limiting switch is pressed by the sliding block. According to the high precision gatage limiting device, the gear transmission structure is adopted to achieve horizontal sliding limiting, and the problem that measurement is not accurate due to loose of an original cam structure is avoided.