The bending characteristics of drainage plate in super soft foundation and its influence are studied by the theoretical calculation and the model test. Based on the utilization of waste materials, a new type of ribbed structure is proposed, and its bending resistance is theoretically and experimentally analyzed. The results show that the P cr of Euler critical force is very small, and the water flow of Z bend is obviously smaller than that of S bend. When the bending rate increases from 10% to 20%, the vacuum degree of drainage plate core will decrease by 3 to 8 kPa, while the vacuum degree of drainage plate core will decrease by 34 to 46 kPa when the bending rate increases from 20% to 30%. The influence of bending rate on the vacuum degree of plate core and the excess pore pressure of soil is nonlinear. The influence degree is obviously intensified when the bending rate reaches 30%. Based on the idea of waste utilization, the ribbed plate structure is proposed, and the section bending stiffness of ribbed plate structure is 8 times that of the common plate, and the bending resistance of plate body could be increased several times. After reinforcement, the cross-plate strength of dredger fill reaches 16-23 kPa, and the characteristic value of the bearing capacity of mud surface foundation reaches 60-63 kPa, with basically erect plate body after excavation. The ribbed drainage board plays a certain role in enhancing the bending resistance of drainage plate and improving the drainage consolidation effect.