Solar low-temperature waste heat sources below 200℃ were analyzed from the perspective of thermodynamics and an organic Rankine cycle (ORC) power generation system of solar reheat using trough collectors based on the basic solar power ORC generation system was designed. The thermal efficiency of working fluids and the influence of various parameters on the system were studied by establishing a thermodynamic calculation model with four chosen organic substances. The thermal efficiency and net output power of the reheat ORC system and the basic Rankine cycle at different evaporation temperatures, as well as the influence of operating environment on the system were studied by modeling analysis of parabolic trough collector and ORC system. When the reheating pressure ratio was 0.25, results showed that the reheating ORC system can efficiently improve the total efficiency of the system, and the output power increased linearly as evaporation temperature increased. The effect of different working fluids on the ORC system was compared, and the efficiency increase was the largest when using R245fa, which was increased by 4.3%. As the evaporation temperature increased, the overall system efficiency with R245fa as working fluid firstly increased quickly but then increased slowly, and reached the largest value at evaporation temperature between 110℃ and 130℃. Wind speed had minimal influence on the system efficiency, causing changes of only around 1%, while light intensity had great influence on the system efficiency. As light intensity increased, the total efficiency of the system was increased by 5%.