A molding machine for making thermoplastic composites contains: a machine frame, a platform, a heating device, a vacuum member, and a gas barrier film. The machine frame includes a working stage. The platform is mounted on the working stage and includes channels, a curved pattern portion and plural tiny holes which are arranged on the top surface of the platform. The plurality of tiny holes communicate with the channels. The platform also includes a connector fixed on one side thereof and communicating with the channels. The heating device is secured on a bottom end of the platform and heats a working material on the platform. The vacuum member is arranged in the machine frame and includes a pipe for coupling with the connector. The gas barrier film is flaky and covers the top surface of the platform.