Disclosed are a variable connecting rod mechanism and a realizing method thereof. The variable connecting rod mechanism is composed of a base, a support and components. By using the realizing method, connecting rod mechanisms different in type can be obtained by combining or separating and fixing or releasing the components and changing number and size of the components. The base and the support can be used for fixing different components to obtain the connecting rod mechanisms in more types. The variable connecting rod mechanism and the realizing method can be applied in designing and studying of the connecting rod mechanisms and can also be used in practice teaching of the connecting rod mechanisms.