The invention relates to the technical field of vacuum hot pressing, in particular to a vacuum hot pressing technology of an automobile Cu and Mg composite belt. According to the vacuum hot pressing technology, a base is included, and a control cabinet is arranged at one end of the top of the base; a display screen is arranged on the outer wall of the front face of the control cabinet; a work indicating lamp is arranged on one side of the display screen; a control button is arranged at the bottom of the work indicating lamp; the side wall of the side, close to the control button, of the control cabinet is fixedly connected with a first guide wire; the end, away from the control cabinet, of the first guide wire is fixedly connected to a vacuum pressure pump; the side, away from the controlcabinet, of the vacuum pressure pump is fixedly provided with a communicating tube; the end, away from the vacuum pressure pump, of the communicating tube fixedly communicates with the inner wall of afurnace body; a second guide wire is arranged at the top of the first guide wire; and one end of the second guide wire is fixedly connected to the control cabinet. According to the vacuum hot pressing technology, through the scientificity, practicability and effectiveness of the overall structural design, the whole working effect is better, using is more convenient, the working efficiency is improved, and meanwhile the manufacturing cost is lower compared with other similar products.