Pool bottom cleaning device

The invention relates to a pool bottom cleaning device. The pool bottom cleaning device comprises a cavitation jet pump set and a water suction filtering pump set, the cavitation jet pump set is connected with a water pumping pipe and a water spraying pipe, the tail end of the water spraying pipe is connected with a cavitation jet nozzle, the water suction filtering pump set is connected with a filtering water suction pipe and a backflow pipe, the cavitation jet nozzle and the tail end of the filtering water suction pipe are detachably connected to the same support, and the cavitation jet nozzle and a filtering water suction opening formed in the tail end of the filtering water suction pipe face the same position. Therefore, the cavitation jet pump set sucks water in a pool and sprays the water out through the cavitation jet nozzle to flush dust deposited at the bottom of the pool, the water suction filtering pump set sucks and filters the flushed water with the dust, and then the filtered water is discharged