The utility model provides a non - guy rope well repairing machine, the fire fighting truck comprises, the middle part of vehicle chassis rear end with fall articulated linking to each other of bottom of A -frame, two sides of vehicle chassis rear end are equipped with the support base respectively, vehicle chassis's two sides of the left and right sides are equipped with two scalable hydraulic legs respectively, vehicle chassis's front portion is equipped with the engine, the upper portion of the front end of falling A -frame links to each other with the top of bearing diagonal pole is articulated, the upper portion cartridge of the derrick lower part of the body has the derrick upper part of the body, concertina movement can be made along the derrick lower part of the body in the derrick upper part of the body, the left end and the right -hand member at derrick upper part of the body top link to each other with the top of a scalable bracing piece is articulated respectively. Its purpose provides the very hard season that can be frozen on ground to accomplish fixed to the derrick fast, let the steady job become swiftly, convenient, work efficiency is high, fixing device occupation space is very little, also can effectively fix the non - guy rope well repairing machine of derrick in the place that the oil workover rig has barriers such as massif, river, huge stone, tall and big trees on every side.