Water conservancy monitoring sensor support capable of moving back and forth and use method thereof

The invention belongs to the technical field of water conservancy monitoring, and relates to a water conservancy monitoring sensor support capable of moving back and forth, which comprises a holding pole, a cross rod, a sensor support and a sensor, the suspended end of the cross rod horizontally extends out and covers the upper part of water flow to be monitored, and the bottom of the cross rod is slidably connected with the sensor support through a dovetail groove and a dovetail block; the bottom of the sensor support is connected with a sensor, a large pulley is arranged at the suspended end of the cross rod, a steel cable is connected between the upper universal ratchet wheel and the lower universal ratchet wheel, and the steel cable is bound to a rotating shaft of the upper universal ratchet wheel, wound around the large pulley, then fixedly connected with the sensor support and finally bound to a rotating shaft of the lower universal ratchet wheel. The invention further discloses a using method of the wa