Vacuum preloading combined with electro-osmosis is one of the most commonly used method to treat dredged slurry, but there are problems such as blockage of drainage boards, serious electrode corrosion and high energy consumption which results in its limited use in engineering practice. In order to overcome the shortcomings of vacuum preloading combined with electro-osmosis method, this paper proposes a vacuum preloading- step-by-step energy dynamic compaction combined with electro-osmosis. Through five groups of laboratory model contrast tests, the pore pressure dissipation ratio (PPDR) was used to determine the dynamic compaction start-up time, and the optimal value was studied. During the tests, the pore water pressure, drainage volume, surface settlement and in situ strength of soil were monitored. The water content, vane shear strength and anodic corrosion were measured before and after the test. The test results showed that: compared with the test group of vacuum preloading combined with electro-osmosis method, the dynamic compaction in the vacuum preloading stage can crack the soil column caused by silting and effectively improve the drainage efficiency. After dynamic compaction, the cracks on the soil surface were reduced and the soil sample was more flat. The amount of anodic corrosion and energy consumption in the process of electro-osmosis consolidation were decreased. The drainage increased the most and the increase of settlement was the greatest and the shear strength after treatment reached 65 kPa when PPDR was 70%, under which a better treatment effect was obtained.