The energy structure of energy supply project always adopts traditional and renewable energy together for the past years. However, for the future development, renewable energy will gradually increase the proportion, or even completely replace the traditional energy. The actual energy supply engineering energy utilization effect is worthy of attention. There are two schemes to discuss: engineering test and software simulation. Engineering test will be time-consuming, while software simulation can save a great deal of costs, as well as carry out the design and verification of various control schemes. Therefore, the integrated solar-ground source heat pump for biogas digester heating system simulation was studied. The typical day and year energy utilization effects of the heating system were obtained by using TRNSYS platform with Type109-TMY2 (reader and meteorological data processor), Type71 (vacuum tube solar collector), Type60 (storage tank), Type3b (circulating pump), Type60c (methane), Type668 (heat pump), Type557b (buried pipe), Type14h (operation controller), Type25a (print results) modules. Results showed that in the typically coldest winter day, the total heat supplying capacity was 225.52MJ/d, which included heat pump power consumption (57.24MJ/d), water pump power consumption (13.39MJ/d), buried tube (71.93MJ/d) and solar collector (82.96MJ/d). The total heat dissipation capacity was 208.57MJ/d, which contained biogas pool maintenance structure heat (132MJ/d) and liquid heating load (76.57MJ/d). The annual total heat consumption of the system was 46657.32MJ, the renewable energy included solar contribution (63%) and geothermal contribution (37%), which accounted for 74%. It showed that renewable energy sources were efficiently utilized in the heating system. Furthermore, the system can store 7630.99MJ/a of heat to the ground but the heat absorption capacity was 12954.81MJ/a. Although the heat storage capacity cannot meet the demand of heat supply, it can alleviate the cold and hot imbalance of soil to some extent.