The application, which belongs to the technical field of splicing construction of shield segments of a subway tunnel, relates to a resistance-trigger type telescopic movable device for measuring dislocation of tunnel segments. The device comprises a metal casing, a leveling and moving adsorption system, and an embedded measuring system. The embedded measuring system arranged inside the metal casing is used for measuring the height differences between the spliced shield segments indirectly. The leveling and moving adsorption system is installed at the lower part of the metal casing and is usedfor carrying out leveling and moving adsorption of the device. Specifically, a piston is pushed by a booster to drive a water tank to enter a glass tube; on the basis of the water level change in theglass tube, dislocation between the shield segments is measured quantitatively; with a suction device, the device is absorbed to the inner wall of the dislocation measuring point of the shield segmentto realize movable absorption of dislocated parts of different segments; and with a camera installed at a positioning pin, real-time extraction of the image information of all dislocated parts of theshield segments is realized and the information is used as the important reference base for maintenance information of the segment dislocation.