Overvalue early warning device for water flow detection and early warning method thereof

The invention discloses an over-value early warning device for water flow detection and an early warning method thereof.The over-value early warning device comprises a side box, a pair of fixing shafts are arranged on the inner wall of the left side of the side box, the right end of each fixing shaft is sleeved with a belt pulley, the two belt pulleys are sleeved with the two ends of a thickened belt correspondingly, and an L-shaped plate is arranged on one side of the middle of the thickened belt; the right side surface of the L-shaped plate is fixedly connected with the inner side wall of the U-shaped plate; a second motor is arranged on the left side wall in the transverse box, a lead screw is arranged at the end of a motor shaft of the second motor, a threaded cylinder sleeves the middle of the lead screw, a pair of rectangular sliding blocks is arranged on the front side face and the rear side face of the threaded cylinder, rectangular sleeves are arranged at the outer ends of the rectangular sliding blo