The invention belongs to underwater robots, and in particular discloses a radiation resistant underwater monitoring robot. A remote controller transmits a control command to a master controller through a CAN bus; the control command is transmitted to a monitoring video recorder, a robot body, a tilt holder, underwater lighting, an underwater camera and a manipulator respectively by the master controller; the monitoring video recorder is a post-processing part for the video data acquisition of the underwater camera, and displays and records video information of the underwater camera; and the sensor acquires and transmits the information on the posture and the pressure of the robot body to the master controller. The robot can run 10 hours continuously under a radiation environment with the environmental dose of 10<5> rad, has a small volume, a compact structure and stable operations, combines automatic control and manual control, and meets the control with different motion requirements.