The invention relates to the technical field of medical instruments, and discloses a bladder irrigator for urinary surgery, which comprises a movable machine body, a partition plate is mounted in the machine body, a machine door is hinged to the machine body, and the interior of the machine body is divided by the partition plate to form two independent cavities; the flushing mechanism is arranged in the cavity located above the partition plate, and the flushing mechanism is used for flushing the interior of the bladder of the patient; the waste liquid collecting mechanism is arranged in the cavity located below the partition plate and comprises a negative suction assembly, a liquid collecting assembly and a smashing assembly, blood clots, mucus and the like doped in waste liquid can be smashed through the smashing assembly, the waste liquid can be conveniently discharged through a liquid discharging valve, and therefore the liquid discharging valve is effectively prevented from being blocked; and rapid discharge of waste liquid can be achieved, the liquid discharge efficiency of the flusher is greatly improved, and efficient flushing of the bladder of a patient is facilitated.