The invention discloses an oil return control method for a refrigerating system. The oil return control method comprises the steps of: 1) setting a first preset liquid level, a second preset liquid level, a first preset temperature and a second preset temperature, wherein the second preset liquid level is higher than the first preset liquid level, and the second preset temperature is higher than the first preset temperature; 2) detecting liquid level in an oil return device and comparing the detected liquid level with the first preset liquid level, when the detected is lower than the first preset liquid level, opening a gas return port and a liquid inlet port; detecting the liquid temperature inside the oil return device and comparing the detected liquid temperature with the first preset temperature, when the detected liquid temperature is lower than the first preset temperature, starting heating and opening the gas return port; 3) when the detected temperature is not lower than the second preset temperature and the detected liquid level is not lower than the second preset liquid level, entering the next step; 4) closing the liquid inlet port, opening an oil return port for returning oil, and when the detected liquid level is lower than the first preset liquid level, entering the step 2). According to the oil return control method for the refrigerating system, the phenomenon of oil shortage on the system is avoided, the components wear is reduced, and the service life is prolonged.