The invention belongs to the technical field of coupling and disconnection of a railway wagon coupler and specifically relates to an auto-demonstration teaching mold of a car coupler tri-state experiment and a demonstration method for the same. In order to automatically demonstrate car coupler tri-state working principles and let employees know and master a composition structure of the car coupler and car coupler tri-state action principles in a simple, visual and straightway manner, the invention further provides the auto-demonstration teaching mold of the car coupler tri-state experiment and the demonstration method for the same. The mold comprises a machine part system, an electric control system and a dynamic transmission system, wherein the dynamic system comprises two independent transmission mechanisms; one mechanism is used to transmit power to unlocking and full-opening experiments; and the other mechanism is used to transmit the power for a lockout experiment. Through application of the mold provided by the invention, a tri-state course of the car coupler can be demonstrated rapidly, visually and automatically, so that the employees can know and master the composition structure of the car coupler and the car coupler tri-state action principles in a simple, visual and straightway manner and a foundation can be laid for realizing technical inspection and fault handling of the railway wagon coupler.