The invention discloses a robot suitable for underwater fishing operation, which at least comprises a submarine cabin at underwater, a ship body above water, a control system and a power system; a submarine cabin cover, a track chassis, a mechanical arm, a tooth shovel, a connecting joint, and a propeller are arranged on the submarine cabin; the mechanical arm is arranged at the front end of the submarine cabin cover through the connecting joint, and the tooth shovel is connected with the mechanical arm; the propeller is placed in the submarine cabin cover, and used for driving the progress ofthe submarine cabin and changing the underwater driving direction of the submarine cabin; a water pump pipe, a fishing water cabin, a water pump, a lift pipe, a first control valve, a funnel pipe, asecond control valve and a holothurian collecting box are arranged on the ship body; the control system comprises a single chip, a cable and a controller; the power system comprises an electric motorand a storage battery unit. The robot applies the mechanical system to replace people to complete the underwater operation; the function device provides performance extension for the whole robot; therobot is exact in seabed location, high in underwater working efficiency, and good in waterproof performance; meanwhile, the robot can adjust the free adjusting floating force and has strong underwater cross-country power.