Surface mine blasting hole water depth detection device

The invention relates to the technical field of surface mine blasting, and discloses a surface mine blasting hole water depth detection device which comprises a barrel, the bottom of the barrel is open, a winding motor is fixedly connected to the top of an inner cavity of the barrel, and the output end of the winding motor is connected with a winding roller through a transmission mechanism; a cable is wound on the winding roller, one end of the cable penetrates through a wire guiding mechanism and is fixedly connected with a sinking base plate, a sinking hole is formed in the sinking base plate, an ultrasonic transmitter is fixedly connected in the sinking hole, the cable is sleeved with a floating ring, an ultrasonic receiver is fixedly connected to the floating ring, and a plurality of floating mechanisms are arranged on the floating ring in the circumferential direction at equal intervals; the fixing ring is fixedly connected to the bottom of the outer wall of the barrel, and a plurality of fixing mechanis