Control method and device of refrigeration equipment, controller and refrigeration equipment

The invention relates to a control method and device of refrigeration equipment, a controller and the refrigeration equipment. When refrigeration control is carried out on the refrigeration equipment, the current opening value of an electronic expansion valve is obtained; according to the pre-established corresponding relation between the frequency of a compressor and the opening value of the electronic expansion valve, the target frequency, corresponding to the current opening value of the electronic expansion valve, of the compressor is determined; and therefore, the target frequency corresponding to the compressor can be determined according to the actual opening values of the multiple electronic expansion valves, then the compressor is controlled to operate, namely cooperative control over adjustment of the electronic expansion valves and frequency conversion of the compressor can be achieved, therefore the refrigeration requirement can be fully met, the operation efficiency of the refrigeration equipment