The invention provides a fracture-width adjustable type inner visible three-dimensional fracture permeating device. The device comprises a permeating instrument, an air-liquid supplying control systemand a data acquiring analyzing system, wherein the permeating instrument mainly comprises an upper cover steel plate, a silica gel plate, toughened glass plates, cellophane which is attached to a 3Dprinted coarse fracture surface, and a lower coiled steel plate; a water guide channel is formed between the two toughened glass plates to which the cellophanes are attached, and the opening degree ofthe water guide channel is adjusted through a feeler gauge; the fiver parts of the permeating instrument are connected and sealed through high-strength bolts; an electric pressure testing pump and ahigh-pressure air pipe are used for supplying pressure to an air-liquid supplying part; the fluid pressure is adjusted by a control part through a valve; permeating pipelines are connected through oxygen rubber tubes, and each connecting part is sealed through a combination gasket; the data acquiring analyzing part comprises a pressure sensor, a flow meter and a paper-free recorder; and data are transmitted to the paper-free recorder through the pressure sensor and the flow meter, and the data are acquired and analyzed through a computer.