The utility model relates to the technical field of water pumps and discloses a novel structural centrifugal pump. According to the technical scheme, a gasoline engine side cover and a water pump seat are combined to form a whole pump base, a side cover end and a pump seat end are arranged at two ends of the whole pump base respectively, a position between the side cover end and a gasoline engine is sealed through an oil-proof asbestos gasket, a position between the pump seat end and a water pump is sealed through an oil-proof rubber O-shaped ring, the whole pump base and a gasoline engine output shaft are connected through a bearing and sealed through an oil seal, an impeller and the gasoline engine output shaft are connected through a screw thread and sealed through a mechanical water seal, during operation, the gasoline engine output shaft drives the impeller to rotate, when water is filled in a pump body, the impeller rotates to throw out water, at the moment, negative pressure is generated in the water pump, water on the side of a water inlet is continuously sucked into the water pump, and so repeatedly circulates to achieve functions of the centrifugal pump. The novel structural centrifugal pump has the advantages of simple structure, small size and weight, low costs, high performances and the like.