Visualized tri-axial loading-unloading seepage test device of clay rock

The present invention provides a visualized tri-axial loading-unloading seepage test device of clay rock, comprising a loading-unloading system and a fluid flow system. The loading-unloading system comprises a confining pressure apparatus, a normal pressure apparatus and two transverse pressure apparatuses. The interior of the confining pressure apparatus is used for placing a rock sample, the topthereof is provided with an upper through hole, and the left and right side faces thereof are respectively provided with side through holes. A lower end of the normal pressure apparatus passes through the upper through hole and locates in the confining pressure apparatus, for applying a normal downward pressure to the rock sample. The two transverse pressure apparatuses are disposed at left and right sides of the rock sample, one end passes through the side through holes and locates in the confining pressure apparatus, for applying a transverse pressure to the rock sample. The fluid flow system comprises an input mec