A decontamination system for field work comprises a decontamination box body, the internal of the decontamination box body is divided into a decontamination machine arranging room for arranging a decontamination machine, a decontamination room provided with a soup pot and a flushing device, and a dressing room used for changing clothes, wherein the decontamination machine, the soup pot and the flushing device are connected with a decontamination pipeline, the decontamination pipeline is divided into two channels, one of the two channels is a clear water pipeline, the other one of the two channels is a pipeline of decontamination water obtained by uniformly mixing clear water with a decontamination soup, a control valve used for free switching is arranged between the clear water pipeline and the decontamination water pipeline, the pipeline connecting the clear water with the decontamination soup is provided with a mixer used for uniformly mixing two liquids, and the decontamination box body on the sidewall of the dressing room is provided with a door used for entrance and exit. The decontamination system provides a safe decontamination work platform realizing onsite fast decontamination, provides stable low-voltage heating decontamination water, provides a fully automatic decontamination machine convenient to control, and can be used for cleaning and disinfecting people in emergent infectious disease field, preventing the further pollution diffusion and improving the emergency guarantee level.