Soil salt crust can inhibit water evaporation and reduce dust release on the ground, it plays a very important role in the ecological environment of arid regions. In order to obtain the reasonable salinity for salt crust of aeolian sandy soil in arid or semi-arid areas, 0.1%, 0.2%, 0.5%, 1.0%, 2.0%, 3.0%, 4.0%, 5.0%, 6.0% and 7.0% NaCl were added to aeolian sandy soil collected from east Taklamakan Desert in Xinjiang, the strength and toughness of salt crusts were tested by piezometer, the microstructures of salt crusts were observed by electron microscopy, and then the effects of NaCl content on the compress strength and wind erosion resistance of salt crust were analyzed. The results showed that NaCl content had great impact on the compress strength and toughness of salt crust, with the increase of NaCl content, the strength and toughness of salt crust increased first and then decreased. However, the peaks of compress strength and toughness of salt crust were not synchronized, which appeared at 3.0% and 4.0% of NaCl content, respectively. Spotted aggregation of salt crystal appeared on soil surface after NaCl content > 4.0%, which led to unevenness and complicated changes in compress strength of salt crust.