The invention discloses a cylinder type maritime work platform which comprises a main ship body and a top layer deck located above the main ship body. A cabin and an entertainment area are arranged in the main ship body, a living area is arranged above the top layer deck, an office and a control cabin are arranged above the living area, the side wall of the main ship body extends and is provided with a cantilever member towards the direction far away from the main ship body, the cantilever member is provided with a connecting column, and the connecting column is arranged upwards. An emergency towing device is installed on a circumference casing of the main ship body, and a plurality of propellers are installed on the bottom surface of the main ship body. According to the cylinder type maritime work platform, on one hand, the outer side wall of the main ship body is cylindrical by changing the shape of the main ship body, the top surface of the outer side wall is arranged upwards, and the problem that a conventional half shallow type ship is large in sagging and hogging bending load, so that the ship body is easily subjected to fatigue failure is solved; on the other hand, the cylinder type maritime work platform is provided with a living platform, life of several hundred people on the sea can be achieved, and living comfort of the maritime work platform is guaranteed.