The invention discloses a length-changeable reinforcement equal-distance tailoring device. The device comprises a base plate; a driving roller is arranged on a rotating transverse shaft; two guide rollers are arranged on the other support side plate; a mounting frame is arranged between two support side plates; a rotary cutting tool is mounted on the lower side of the mounting frame; a fixed lifting rod penetrating through a top plate is arranged at the top end of the mounting frame; a magnet plate is arranged at the top end of the fixed lifting rod; the lower end surface of a magnet block isconnected with the top plate through a first spring; rotary push plates hinged with the side surfaces of the support side plates are arranged on the right side surfaces of the support side plates; thelower end of an upper push sealing plate is connected with fixed blocks arranged on the upper end surfaces of the rotary push plates; and the fixed blocks are slidingly connected with the upper end surfaces of the rotary push plates. The device is simple in structure, can continuously cut multiple reinforcement sections with the same length, and meanwhile, is invariable in reinforcement cutting length, accurate in cutting length, convenient to operate, higher in linkage, lower in labor capacity and higher in practicability.