The invention discloses a solid-liquid phase change material melting heat transfer performance parameter testing system and a method thereof. The system comprises a phase change material container, a liquid phase material expansion port, an expansion tube provided with a liquid level sensor, a heat insulation sleeve, an analog-to-digital converter and a computer; a solid-liquid phase change material is contained in the cavity of the phase change material container, the top of the symmetrical center of the phase change material container is provided with the liquid phase material expansion port, the liquid phase material expansion port is connected with the expansion tube provided with the liquid level sensor, the expansion tube provided with the liquid level sensor is wrapped by the heat insulation sleeve, a liquid level simulation signal of the liquid level sensor is transmitted into the analog-to-digital converter in real time, and a data signal derived by the analog-to-digital converter is transmitted to the computer. Automatic measurement, operation and display of the melting rate, the integral heat exchange coefficient and other key heat transfer performance parameters of a phase change material in an internal non-visual container can be realized within a certain precision range through reasonable hypothesis and strict derivation based on volume expansion data in the solid-liquid phase change melting process.