A preheating type solar ejection-compression combined refrigerating system comprises a solar hot-water loop, an ejection refrigerating fluid loop, an electric compression refrigerating fluid loop and an air conditioning water loop. The ejection refrigerating fluid loop is connected with the electric compression refrigerating fluid loop through a preheater. The ejection refrigerating fluid loop is formed by a generator, an ejector, a jet condenser, a jet evaporator, a work medium pump, a preheater and a second pipeline in a series connection mode. The electric compression refrigerating fluid loop is formed by a preheater, a compressing condenser, a throttle mechanism, a compressing evaporator, a compressor and a third pipeline in a series connection mode. According to the preheating type solar ejection-compression combined refrigerating system, heat of condensation of refrigerating fluid in exhaust gas of the compressor in the electric compression refrigerating fluid loop is recycled and used for preheating the refrigerating fluid entering the generator, the design heat exchange area of the generator of an ejection refrigerating system and the condenser of a compression refrigerating system can be decreased, and the system refrigerating capacity of the solar unit heat collection area is improved. The preheating type solar ejection-compression combined refrigerating system is suitable for air conditioning systems of radiant cooling, fan coils and the like.