To the phenomenon of clogging and clumping easily caused by excavating clay,this study takes the excavation of clay with a rake head as the research object.Combined with the problems encountered by trailing suction hopper dredgers in the construction process of actual engineering,such as clogging rake,trapped rake,and sliding rake,the original rake head model of a large trailing suction hopper dredger is analyzed through numerical simulation of computational fluid dynamics under different working conditions,and the internal flow of the rake head and suction pipeline is analyzed,providing reference for the design of nozzle angles and nozzle arrangements in high-pressure flushing of the rake head.The results indicate that when the nozzle angle is 10°,the impact angle of high-pressure flushing can effectively wash away the sticky areas of clay,which is beneficial for the transportation of clay.When the nozzles are distributed in a forked pattern and the nozzle spacing is 115 mm,the pressure core has a significant impact on the target surface,and the interference of high-pressure water jets and backflow on the target surface is also relatively small.