In view of a study on the interaction and distribution of thermal and humid environmental factors in the multi-plastic greenhouse group, a corresponding numerical model has thus been established by using the numerical simulation software. In consideration of water and gas transmission, crop transpiration and solar radiation in the greenhouse, also combined with the porous medium model, DO radiation model and component transport model, a simulation has been carried out under natural ventilation conditions with crop transpiration verified. The validation results show that the error between the simulation value and the experimental value is within 15%, verifying the credibility of the numerical model. The results of a simulation by adopting this model show that the air flow velocity in No. 2 and No. 3 greenhouses is reduced due to the obstruction of air flow in No. 1 greenhouse, which leads to the diffusion of moisture and heat carried in the air in No. 2 and No. 3 greenhouses. The transpiration of crops in No. 2 and No. 3 greenhouses is inhibited, with the surface temperature of crops in No. 2 and No. 3 greenhouses gradually increased. The surface temperature of crops in No. 3 greenhouse increases most significantly, reaching a maximum of 309.5 K at the highest point.