The invention relates to the field of soil environment monitoring, in particular to a device for sampling currents in soil. The device comprises a cylindrical outer barrel and an inner barrel with the polygonal cross section. A drill bit is hinged to the lower end of the inner barrel, and the drill bit is composed of multiple triangular steel sheets. A piston ring is arranged on the outer side wall of the inner barrel. An annular cavity is formed among the position below the piston ring, the outer wall of the inner barrel and the inner wall of the outer barrel. A sampling tube is installed in an inner cavity of the inner barrel, an ejector block is installed at the lower end of the sampling tube, and multiple probes are installed on the outer wall of the lower end of the sampling tube. The probes are connected with a signal acquisition device through cables, and length scale marks are arranged on the outer wall of the sampling tube. During sampling, the outer barrel is firstly inserted into the soil, the inner barrel is pushed downwards, the soil in the outer barrel is squeezed outwards, water in the soil converges into the outer barrel, the sampling tube ejects open the drill bit in the inner barrel, and sampling and monitoring are carried out. Acquisition points can be arranged in batches at any time through the device for sampling the currents in the soil according to requirements, and the device is convenient and rapid to install and detach.