The oil bath is a widely used tool in the fields of chemical engineering, petroleum, medicine, and biology. It serves as a controlled, temperature-uniform environment for experiments, testing, and industrial production in various domains such as physical chemistry, metrology, universities, electronic instrumentation, and research institutions. This environment is utilized for conducting constant temperature tests or experiments on test samples or manufactured products. The constant temperature bath control system employs PID automatic control, features a touchscreen display, and utilizes a water pump to control external circulation, allowing for the output of constant temperature liquid from within the bath.