Linkage device provided with four screw propellers

The invention relates to a linkage device provided with four screw propellers. The linkage device comprises a power device, wherein the power device is connected with a first drive rod through a drive device, the first drive rod is connected with a second drive rod through a universal coupling, each of the first drive rod and the second drive rod is connected with a gear box, the gear boxes are connected with screw propeller drive shafts, and one screw propeller is arranged at each of the front end and the rear end of each screw propeller drive shaft; the power device adopts a gasoline engine; the drive device comprises a chain wheel I connected with the power device, a chain wheel II connected with the first drive rod and a chain connecting the two chain wheels. The linkage device has the benefits as follows: the linkage device is provided with the four screw propellers, propelling force for a ship is increased, the effective working time is prolonged, and the navigational speed is increased; besides, the power device adopts the gasoline engine, has good startability and generates smaller vibration and lower noise during working particularly in the low-temperature winter.