Abstract: Combining with the climate characteristics of large temperature difference between day and night in Xinjiang region,this paper sets up a set of small solar heat collection-sky radiation cooling dual-purpose system in Urumqi. By comparing the number of PE wind cover film layers and testing the system operating results under different flow rates,the heat collection/cooling potential of dualpurpose device is explored. The test results show that the maximum temperature difference between inlet and outlet of the system is6.40 ℃ and the maximum instantaneous heat collection power is 721.88 W/m~2under the daytime heat collection mode. In the night cooling mode,the maximum inlet and outlet temperature difference is 0.94 ℃,the outlet temperature is 1.43 ℃ lower than the ambient temperature,and the maximum instantaneous cooling power is 50.89 W/m~2,which provides the possibility for its practical industrial heat collection application and the preparation of high temperature chilled water in the local temperature and humidity independent control air conditioning system.