Regarding the technical problems of high-water content，high compressibility，long dehydration time and insufficient supply of slime field in environmental dredging sediment，we study the electrochemical dehydration drying technology. The field area is divided into four units，namely the unidirectional vacuum，the unidirectional electrochemical，the double direction vacuum and the double direction vacuum electrochemical units，and the parallel comparison test is carried out. The results show that the dehydration effect of the electrochemical unit is more obvious than that of the vacuum preloading unit. Considering the power consumption and dehydration effect，the medium voltage（30 V to 60 V）is the optimal applied voltage value. In addition，the bidirectional drainage structure plays a good role in strengthening the electrochemical dehydration drying technology，which can realize the ectopic and efficient dehydration of multiple batches at fixed sites，and has certain engineering promotion significance for the urban areas with limited land resources.