Abstract: To research the flexural performance of a new type of corrosion-resistant ocean concrete structural component, "stainless steel reinforced coral seawater sea sand concrete beam", eight coral seawater sea sand concrete beam specimens were fabricated with variable parameters of section reinforcement ratio and steel reinforcement type (stainless steel reinforcement and ordinary steel reinforcement). The failure process, failure mode, and crack development process of the specimens were observed through monotonic static loading experiment, and the flexural moment-mid span deflection curves and key mechanical performance indicators of the specimens were obtained. The influence of reinforcement ratio and reinforcement type on the mechanical performance indicators of the specimens were studied. The experimental results indicate that there are two types of failure modes in the specimen: concrete crushing failure and concrete oblique failure; The development of cracks can be slowed down by improving the reinforcement ratio of stainless steel bars, and the cracking load of stainless steel bar specimens is basically the same as that of ordinary steel bar specimens; With the increase of reinforcement ratio, the peak bearing capacity of stainless steel reinforced coral seawater sand concrete beams gradually increases, with a maximum increase of 51.23%, and the initial stiffness gradually increases, with a maximum increase of 40.22%. The peak bearing capacity of stainless steel reinforcement specimens is 69.08% higher than that of ordinary steel reinforcement specimens, and the initial stiffness decreases by 17.53%. According to different national specifications, the cracking flexural moment was calculated, and it is found that the domestic specification calculation values have the highest degree of agreement with the experimental values. On the basis of existing research, a formula for calculating the flexural bearing capacity of stainless steel reinforced coral seawater sand concrete beams has been proposed. The average ratio of the calculated values to the experimental values is 0.98, indicating a high degree of agreement.