The utility model provides a light-adjustable U-shaped tower crane. The light-adjustable U-shaped tower crane comprises a U-shaped hanging bridge, a plurality of hanging frames, illumination devices and a plurality of sliding assemblies. The U-shaped hanging bridge is horizontally arranged. The hanging frames are connected with the U-shaped hanging bridge through the sliding assemblies and can move along the U-shaped hanging bridge through the sliding assemblies. The illumination devices are arranged on the U-shaped hanging bridge. Compared with the prior art, the hanging frames of the light-adjustable U-shaped tower crane are movable, and therefore when a doctor needs to perform the operation in different positions in an operating room, medical devices can be used by moving the hanging frames to the appropriate positions along the U-shaped hanging bridge and then placing the medical devices on the hanging frames, and the medical devices are convenient to move; the illumination devices with various functions are arranged on the U-shaped hanging bridge, and therefore different illumination devices can be turned on according to requirements, rest of patients can not be affected, and medical staff can conveniently conduct guardianship and treatment.