The utility model discloses a coal petrography infiltration characteristic test system under high -voltage pulse jet action, including high -voltage pulse efflux appearance and optical flat scanner, coal petrography infiltration characteristic test system under high -voltage pulse jet action's test method includes following step: step no. 1, choose for use high -voltage pulse efflux appearance tocarry out pulse jet to different thickness size coal petrography samples, adopting the optical flat scanner to the long -pending scanning and shooting that carries on of transmission surface after step no. 2, efflux are intact immediately, observing that throw the surface area and the substitution formula carries out permeability coefficient calculation, visual relevance is carried out to assay coal petrography infiltration characteristic, the utility model discloses with the help of high -voltage pulse efflux appearance, combine optical flat scanning technique to test rock infiltration characteristic, through surveing efflux transmissometer area, calculate the rock osmotic coefficient to carry out visual contact, it is convenient, swift, the utility model provides a test method is simpleand convenient, test cost is low, has important reference meaning to follow -up rock hydrodynamics innovation experiment.