Basalt fiber concrete has been widely used in the engineering field in our country. In order to study its corrosion resistance and mechanical property degradation in chloride environment, 10 kinds of mix proportion are designed and tested in 5% NaCl solution. The size of the test block is 100mm×100mm×100mm. The apparent cracks, effective porosity, water absorption and mass of the block are measured every 30 days; the axial compressive strength test is conducted every 90 days to determine the change of mechanical properties. It is found that the addition of basalt fiber can effectively inhibit the generation and development of concrete cracks and reduce the migration rate of chloride ions. Compared with the ordinary concrete, adding proper amount of basalt fiber can better improve the compressive strength and deformation ability of concrete. When the volume fraction of fiber is 0.1%, it is the most favorable, while when the parameter is more than 0.2%, the performance is reduced. In addition, it is found that the addition of fly ash is not ideal to reduce the effective porosity of basalt fiber concrete and slow down the migration of chloride ions. It is suggested that the thickness of basalt concrete protective layer should not be less than 30mm in chloride corrosion environment. Finally, on the basis of experiments, the strength degradation model of basalt fiber concrete under chloride erosion is proposed. This study will provide some technical support for the application of basalt fiber concrete in chloride environment.