The invention relates to a production device and preparation method of composite phase-change particles. The production device is characterized by comprising an external barrel, an internal barrel, a stirring mechanism and a support; the internal barrel is arranged in the external barrel in a sleeved mode, the stirring mechanism is fixed in the internal barrel, and the lower portion of the external barrel is connected with the support and fixed and supported through the support; the internal barrel comprises an internal barrel body with the top end opened, an internal barrel upper cover is arranged on the internal barrel body, the internal barrel upper cover is connected with the internal barrel body through a sealing buckle, a sealing washer is arranged inside the internal barrel upper cover, a vacuum extraction hole is formed in the internal barrel upper cover, internal barrel supper cover handles are arranged on the two sides of the vacuum extraction hole respectively, the internal barrel upper cover handles and the internal barrel upper cover are welded together, and an observation hole is formed in the rear portion of the vacuum extraction hole; a vacuum extraction valve is arranged on the vacuum extraction hole, and the vacuum extraction hole is connected with external vacuum extraction equipment; a hollow cylindrical rotating shaft protective barrel with the two ends opened is arranged in the center of the bottom of the internal barrel body, and the rotating shaft protective barrel is welded to the bottom of the internal barrel body.