The invention discloses a manufacturing method of a solar power generation device. The solar power generation device comprises a plurality of film solar cells, M N-type semiconductors, M P-type semiconductors, a heat-conducting base, an accumulator unit, a controller unit, 4M temperature sensors, a water pump, N electric valves, and N water pipes; the N-type semiconductors and the P-type semiconductors are I-shaped; guide baffles are staggered in a water storage cavity of the heat-conducting base; the lengths of the N water pipes are different, the length range is between 5-200m; the N-type semiconductors and the P-type semiconductors are arranged at intervals, and the adjacent N-type semiconductor and the P-type semiconductor are in series connection; the plurality of film solar cells are connected in series, and then connected with the N-type semiconductor and the P-type semiconductor in series, and finally used for charging the accumulator unit. The solar power generation and the thermoelectric power generation are effectively combined by the method provided by the invention, an efficient technical scheme of utilizing solar energy and geothermal energy is provided, and the power generation efficiency is higher.