The invention discloses a mining roadway rock stratum displacement monitoring device for underground engineering. The device comprises a mounting plate mounted on the top wall of a roadway; a measuring mechanism is mounted at the lower end of the mounting plate; two detection grooves are symmetrically formed in the side wall of the roadway; a balance mechanism is jointly mounted in each detectiongroove and at the bottom of the roadway; and the measuring mechanism comprises a measuring box. According to the device of the invention, the comprehensiveness of detection is improved through the twobalance mechanisms; the balance mechanisms and the measuring mechanism are connected through a rope so as to perform detection; high-precision equipment is more suitable for a roadway environment andcarrying out real-time monitoring; the horizontal placement of the measuring box is realized through adjusting screws; the balance of the measuring box is achieved through weight balancing columns; the long-term use of the device is facilitated; the balance mechanisms, the rope and a double-wheel-groove mechanical structure perform transmission outside the measuring box, and a feedback disc, a light sensor and light emitters are located in the measuring box, and therefore, the interference of the outside on measurement is reduced, and measurement accuracy is improved.