The invention discloses underground reservoir drainage equipment. The underground reservoir drainage equipment comprises a gravel bin, a water inlet pipe and a water outlet pipe; the water inlet pipeis provided with a water inlet pipe control switch, and the water outlet pipe is provided with a water outlet pipe control switch; a water outlet pipe connector is formed in the bin wall of the gravelbin, and the water outlet pipe is in sealing connection with the water outlet pipe connector; the bin wall is further provided with a water inlet pipe connector, and the water inlet pipe is slidablyconnected with the water inlet pipe connector; the underground reservoir drainage equipment further comprises a driving component; the gravel bin is internally provided with an adjusting baffle, and the adjusting baffle is located below the water inlet pipe connector; the adjusting baffle is provided with an angle sensor, and the angle sensor is in communication with a control unit in the drivingcomponent. The invention further discloses a control method of the underground reservoir drainage equipment. During normal work, sludge can be simply removed, the safety of an underground reservoir isguaranteed, the workload is reduced, and the work efficiency is improved.