The invention provides an axle housing cleaning and carrying trolley adopting V-shaped positioning and a size determining method, and belongs to the field of machine manufacturing. According to the cleaning and carrying trolley and the size determining method, the design of a trolley body combining part, a left V-shaped positioning assembly, a plane limiting assembly and a right V-shaped positioning assembly is adopted, the size determining method is studied, and therefore axle housing parts adopting V-shaped positioning are accurately positioned and placed on the cleaning and carrying trolley, and the requirement for cleaning adaptability of the inner surfaces and the outer surfaces of the axle housing parts and the requirement for light and stable non-lifting stepping conveying are met. The axle housing cleaning and carrying trolley is novel in structure, the method is clear and easy to implement, and the axle housing cleaning and carrying trolley adopting V-shaped positioning and the size determining method have popularization and application value.