The invention discloses a real-time rendering interactive cinema system and a real-time rendering interactive cinema method based on multi-modal interaction. The system comprises a network module, a dynamic platform module, a Kinect action recognition module, a mobile phone interaction module, a feedback module and an arc screen three-dimensional rendering module, wherein by virtue of the network module, communication and data transmission paths are provided; the dynamic platform module is used for acquiring attitude data for driving a three-freedom-degree seat and a six-freedom-degree platform in real time; the Kinect action recognition module is used for acquiring body actions of a user and for conducting data coding; the mobile interaction module is used for acquiring and encapsulating user input; the feedback module is used for implementing feedback on an arc screen in accordance with the input information and the body actions of the user; and the arc screen three-dimensional rendering module is used for rendering left and right eye frame pictures corresponding to a role viewpoint by virtue of a three-dimensional camera, splicing and fusing the left and right eye frame pictures, sequentially outputting the left and right eye frame pictures in an alternate mode and projecting the left and right eye frame pictures on the arc screen so as to obtain a three-dimensional picture. The real-time rendering interactive cinema system disclosed by the invention has abundant interactive modes and a strong sense of immersion of interactive equipment, so that the user can enjoy more real experience and the problem of an interactive cinema which has a single interactive mode can be solved.