Penetration test device for researching soil internal erosion anisotropy under action of stress

The invention relates to a penetration test device for researching soil internal erosion anisotropy under the action of stress. The device comprises a seepage system, a pressure water supply system, an axial pressure applying system, an outflow collecting system and a data acquisition system; the seepage system comprises a support, a permeameter, a collecting funnel and a pore pressure sensor; thepermeameter is arranged on the support; the collecting funnel is arranged at the lower end of the permeameter and is communicated with the permeameter; the pore pressure sensor is arranged on the permeameter; the permeameter comprises a permeation cavity and a top cover; the permeation cavity is of a structure with openings in the upper end and the lower end; the collecting funnel is arranged atthe lower end of the permeation cavity and is communicated with the permeation cavity, a pore pressure sensor distribution hole, an exhaust hole and a water inlet are formed in the side wall of the permeation cavity, and the w