The industrial-grade high-precision submerged laser 3D printer developed by our company has the advantages of high precision, good stability, low cost, and strong environmental adaptability. It is equipped with a high-precision industrial laser generator and a precision digital galvanometer, and adopts a high-precision liquid level sensor and a negative pressure adsorption coating system. This can ensure the uniformity and flatness of the printed layers, and the layer thickness can be accurately controlled to 0.05mm. The device has a built-in constant temperature and humidity device, so users do not need to prepare a separate constant temperature room. It can be widely applied in multiple related fields, such as personal design, industrial research and development, etc.