PTHW electric heating sleeve is an electric heating sleeve that achieves constant temperature heating through electronic pressure regulation. It uses alkali free glass fiber as insulation material, with Cr20Ni80 alloy wire spring installed in it. It is insulated with a hemispherical insulation body formed by vacuum shaping with aluminum silicate cotton. The shell is injection molded in one go, and the upper cover adopts electrostatic spraying technology. Due to the use of spherical heating, the heating area of the container can reach more than 60%. It has the characteristics of fast heating, high temperature, easy operation, and durability. Specially suitable for liquid heating and reaction experiments in laboratories of industries such as pharmaceuticals, petroleum, chemical engineering, colleges and universities, and environmental protection.