Constant temperature control method for vegetable greenhouse

The invention provides a constant temperature control method for a vegetable greenhouse. A certain coupling relationship between the temperature and the humidity is considered, and the control of onefactor often causes the change of the other factor. Therefore, in winter greenhouse environment control, the principle of temperature control priority is defaulted, and after the temperature conditionis met, the humidity condition is met. Under the condition that the temperature is too low and the humidity is too high, heating serves as a leading part, ventilation and humidity reduction can be performed only when the temperature rises to a certain value, and on the other hand, relative humidity can be reduced due to temperature rising. In the cooling and humidifying process of the summer, theprinciple of humidity priority is adopted, after the humidity condition is met, the temperature condition is met, for example, under the conditions that the humidity is too low and the temperature istoo high, cooling is taken