Based on the characteristics of Chaerhan Salt Lake in west China, the corrosion solution with the same SO42- concentration as the salt lake brine was prepared, and the volume content of steel fiber (STF) (1% and 2%) and basalt fiber (BF) (0.1% and 0.2%) were used as variable parameters in the laboratory accelerated salt spray corrosion test for a total period of 200 days to simulate the durability damage deterioration of fiber reinforced concrete in the salt lake area. In order to provide a theoretical reference for the civil engineering construction in this area, a relative dynamic elastic modulus degradation Wiener model was established with random effect constraints, with which the residual life of the concrete was predicted and the reliability of the prediction result was evaluated. The results show that when the STF content is 2% and BF content is 0.1%, the change of concrete durability damage is the smallest, and the predicted residual life of the fiber concrete is 354 d. Adding appropriate amount of steel and basalt fiber can effectively improve the durability damage deterioration of the concrete in salt spray corrosion environment. The prediction results of the improved Wiener model are in good agreement with the measured data, which indicates that the model is reliable.