The invention discloses special equipment for in-situ disassembling of a long tunnel shield. The special equipment comprises a main framework, hydraulic retractable supporting legs, an overturning mechanism, a hoisting mechanism, a rotary mechanism, a main suspension arm and an auxiliary suspension arm, wherein the hydraulic retractable supporting legs are arranged under the main framework and are used for supporting the main framework; the overturning mechanism comprises an overturning frame and an overturning oil cylinder; the lower end of the overturning frame is hinged to the upper side of the back part of the main framework; the hoisting mechanism is arranged in the upper part of the overturning frame; one end of the overturning oil cylinder is hinged to the main framework; the other end of the overturning oil cylinder is hinged to the overturning frame and is located just in front of the overturning frame; the main suspension arm is horizontally arranged; the front end of the main suspension arm is connected with the hoisting mechanism, and the main suspension arm is pushed by the hoisting mechanism to move up and down; the auxiliary suspension arm is arranged just above the main suspension arm in parallel; the front end of the auxiliary suspension arm is mounted on the main suspension arm through the rotary mechanism so that 360-degree rotation is realized; the rear end of the auxiliary suspension arm stretches to the rear side of the main suspension arm and stretches backwards through a horizontal retractable oil cylinder which is arranged inside. The safety and reliability in a disassembling process can be improved, the disassembling time of the equipment is also shortened and manpower resources are saved.