Bridge bottom surface coating device

The invention discloses a bridge bottom surface coating device. The bridge bottom surface coating device comprises a first sliding track groove formed in a side wall of a bridge, jacks are mounted attwo ends of the first sliding track groove, and a sliding block which is driven by a motor to move back and forth on the first sliding track groove is arranged on the sliding track groove. The bridgebottom surface coating device is characterized in that the lower portion of the sliding block is connected with an upper tube sleeve, the upper tube sleeve is hinged to a lower tube sleeve, a second motor which drives the lower tube sleeve to rotate is mounted on a side of the upper tube sleeve; a steel wire rope winding and unwinding machine is mounted on the sliding block; a steel wire rope penetrates through the upper tube sleeve and the lower tube sleeve; one end of the steel wire rope is connected with the steel wire rope winding and unwinding machine while the other end of the steel wirerope is connected with a s