Impregnation device and impregnation method

The impregnation device comprises an upper-layer frame and a lower-layer frame, a liquid feeding device is arranged in the lower-layer frame, multiple layers of working liquid tanks are arranged in the upper-layer frame, a product placing frame is arranged above each layer of working liquid tank, and the multiple product placing frames are fixedly connected through first connecting rods; the impregnation device further comprises a lifting driving mechanism used for driving the product containing frame to do lifting motion relative to the multiple layers of working liquid tanks, an inflow hole is formed in the side face of each layer of working liquid tank, and an inflow pipeline is arranged between the liquid feeding device and the inflow hole. The depth of the liquid immersion tank can be adjusted by adjusting the height of the liquid level plate in the device, so that the device can adapt to liquid immersion operation of products of different models, and meanwhile, the concentration of liquid can be conveni