The utility model discloses a main engine cylinder oil leakage detection device. The device comprises a plurality of cylinder oil storage cabins, a cylinder oil transfer pump and a cylinder oil measuring cabinet, the plurality of cylinder oil storage cabins are connected with a cylinder oil transfer pump through a first pipeline; the cylinder oil transfer pump is connected with a cylinder oil measuring cabinet through a second pipeline; compared with a conventional air cylinder oil system, the air cylinder oil measuring cabinet and the air cylinder oil transfer pump are additionally arranged,monitoring of oil supply of the air cylinder oil system to the main machine is achieved by judging the operation state of the pump, and the safety of the system is greatly improved. The situation thatleakage of the cylinder oil system cannot be found in time can be prevented; damage to crew due to fire caused by cylinder oil leakage is prevented; economic loss caused by cylinder oil leakage is prevented; according to the utility model, the safety of ship navigation is improved, and economic loss caused by cylinder oil leakage is avoided.