Foundation pit dewatering well water level monitoring tool

The utility model discloses a foundation pit dewatering well water level monitoring tool which comprises a pay-off mechanism and a guide mechanism, a center through hole is formed in the center of a well lid, the pay-off mechanism comprises a roller, a first support and a control box, a center shaft of the roller is driven by a motor to rotate, and the guide mechanism comprises a guide cylinder and a second support. A plurality of pressure strain gauges are installed on the circumferential side of the inner wall of the guide cylinder, one end of the traction rope bypasses the guide cylinder and penetrates through the center through hole to be connected with the top of a floating plate in the foundation pit dewatering well, and an encoder used for measuring the number of rotation turns of a center shaft of the guide cylinder is arranged on the second support. The well cover is used for blocking the well mouth of the foundation pit dewatering well, other people are prevented from falling into the well, safety a