The invention provides a temperature and humidity cooperative control method for an electrical equipment module cabinet. By means of the method, temperature control and humidity control over the interior of the electrical equipment module cabinet and temperature and humidity control over outlet air of a temperature and humidity control system can be effectively achieved, and the operating environment of electrical equipment in the cabinet can be significantly improved. By additionally arranging a semiconductor dehumidifier special for humidity control and adopting an original air conditioningsystem special for temperature control, independent control over temperature and humidity is achieved; by installing a return air reheating heater at an outlet air duct of the original air conditioning system to conduct heating on outlet air (also called return air reheating), the temperature and relative humidity of the outlet air are within a reasonable range, and source control is achieved. According to the cooperative control strategy, corresponding control modes are selected for different situations of the temperature and humidity of air in the cabinet, and the working states of the original air conditioning system, the dehumidifier and the return air reheating heater are cooperatively controlled so as to ensure that the temperature and relative humidity of air in the cabinet and thetemperature and relative humidity of outlet air are within a reasonable range.