The utility model discloses a well mouth rotating frame for a construction site. The well mouth rotating frame comprises a well mouth fixed block which is provided with a guiding block, a guiding groove is formed in the guiding block, a movable block is arranged in the guiding groove, a nut screwing column is connected and inserted into the side wall of the end of the guiding block, the nut screwing column is connected with the movable block through threaded teeth, a groove is formed in the middle of the well mouth fixed block, a guiding wheel is arranged on the inner side wall of the groove, an unreeling wheel is arranged on the well mouth fixed block, the unreeling wheel is wound by a fishing rope, the fishing rope winds around the guiding wheel, one end of the fishing rope is a free end, the other end of the fishing rope is connected with a fishing barrel, the top of the fishing barrel serves as the liquid inlet port, and an iron block is arranged at the bottom in the fishing barrel. According to the well mouth rotating frame, the stretch and retraction length of the movable block and the stretch and retraction length of the guiding block can be adjusted, the well mouth rotating frame can be firmly hung at the well mouth position of the construction site, a user unreels the fishing rope so that the fishing barrel can be quickly hung at the well bottom, a worker can conveniently fish waste articles or waste water or waste residues at the well bottom, and borehole operation is facilitated.