The selection of reinforcement methods in the maintenance and reinforcement of old wharf structure is of great significance for the reinforcement effect，construction difficulty，and economic costs. To study the characteristics of the prestressed carbon fiber board reinforcement method and the enlarged section reinforcement method，we compare the feasibility and reinforcement effect of the two methods and comparatively test the indoor beam bending. The results indicate that the reinforcement effect of the prestressed carbon fiber board reinforcement method is better；the increase in prestress is also helpful in improving the load-bearing capacity of components，and the setting of the initial load can also improve the cracking load of components.