The invention discloses a pipe wrench special for fluidized bed caps. The pipe wrench comprises a movable jaw, a wrench handle and an adjusting nut. The front end clamping mouth positions of the movable jaw and the wrench handle perpendicularly and downwards protrude to form convex lips relative to the plane where a pipe wrench body is located; threads are formed on the opposite faces of the convex lips of the movable jaw and the wrench handle to achieve clamping. The arrangement that the clamping mouth positions of a traditional jaw, a movable jaw and a wrench handle are as thick as a pipe wrench body is changed, the clamping mouth positions of the movable jaw and the wrench handle are conically protruded downwards relative to the plane, and the protruding convex lips can be conveniently and rapidly inserted to the dense caps and clamp the caps in a narrow space; meanwhile, through the outer conical space, rotation is convenient after clamping, interference with other caps is prevented, the caps are replaced greatly conveniently, and the work efficiency of overhauling of a boiler is improved.