Abstract: In order to investigate the formation mechanism and law of heat and humidity environment of solar greenhouse, and to recognize the complex physical phenomenon of multi-physical field coupling within it, according to the structural characteristics of the solar greenhouse, external environmental conditions and other parameters, and establish the prediction model of indoor temperature and humidity for solar greenhouse is established based on the equations of the heat balance relationship on the inner surface of the enclosure structure of the solar greenhouse, the equations of the balance relationship of the heat and humidity in the air and the consideration of the role of wall humidity transfer, soil evaporation and so on. The iterative model is used to solve this model to obtain the indoor temperature and humidity with the assistance of Matlab software using iterative method The results are compared and analyzed with the experimental It is found that the relative errors between the predicted and measured data of indoor air temperature and humidity in two consecutive days are 5.11% and 4.17%, respectively; the consistency indices are 0.98 and 0.94, respectively; and there is no significant difference between the predicted and experimental values. The theoretical predicted values and the experimental measured values have small relative errors, and the model is highly consistent and reliable. The prediction model of indoor temperature and humidity in solar greenhouse on bare ground can be more accurate after considering the effects of wall mass transfer and soil evaporation.