The invention provides a method for controlling the deformation of a flexible virtual reality interaction controller. The method comprises the following steps of: determining that the gesture of a user for holding the VR (Virtual Reality) interaction controller is changed; according to the characteristics of a changed holding gesture, determining an object to be simulated by the VR interaction controller; according to the shape and the holding gesture of the object to be simulated, changing the shape of the above VR interaction controller, and determining the deformation parameter of the VR interaction controller; and according to the deformation parameter, controlling the VR interaction controller to generate the deformation. The invention also discloses a device for controlling the deformation of the flexible virtual reality interaction controller and a VR interaction system. When the technical scheme provided by the invention is adopted, the more figurative VR interaction controller is provided for users, and user experience is improved.