Abstract: In order to be compatible with the current trends in development of intelligent coal preparation, a new method for plotting raw coal washability curve with the use of the software Python based on the commonly used intelligent algorithm platform is proposed. With the use of the method, the Henry washability curve(HR washability curve), a raw coal washability curve plotting method generally used in coal washing operations, can be plotted by referring to the internationally established raw coal float-and-sink analysis data and by using the third-party libraries like NumPy, Scipy, Matplotlib and Pandas. As evidenced by test results, the HR curve is made possible to be plotted in an automatic manner, and the result obtained can well cater to the needs of coal washing operations; and in an intelligent coal washing system, the use of the Python-based plotting method can help realize seamless integration between prediction of separation effects, optimization and decision-making in operation of a heavy-medium coal washing process.