To investigate the effect of repeated loads on the flexural load carrying capacity of marine concrete beams suffering from chloride attack, a total of 10 marine concrete beams and 36 concrete cubes were designed for flexural performance test and compressive strength test, respectively. Three damage mechanisms, including repeated loads with a stress level of 0.4, chloride solution dry-wet cycles and coupling action of repeated loading history and chloride solution dry-wet cycles, were applied for concrete beams and cubes. Test results show that the effect of repeated loads on the degradation of compressive strength of concrete is significantly higher than that on the flexural properties of concrete beams, and the corresponding degradation ratio between them is maintained at about 1.5. The effect of chloride solution dry-wet cycles on concrete compressive strength is 1.8 times higher than that on the flexural load capacity of test beams. Combined with the test data proposed in this paper and some existing studies, the coupling impacts of repeated loading and compressive strength loss on the flexural load bearing capacity of marine concrete beams are discussed by comparing with the formula calculations based on Chinese, American and European concrete codes. The analysis shows that the compressive strength loss rate can effectively reflect the degradation of flexural load bearing capacity of marine concrete beams and that there is an exponential relationship between them.