The invention provides a testing device of the adhesive force of a lithium ion battery pole piece. The testing device comprises a box body and a plurality of bar bodies; an opening is formed in the surface of the box body; and the bar bodies are provided with smooth surfaces and installed at the opening, and two opposite ends of the bar bodies are fixedly connected to two opposite inner walls of the box body correspondingly. The invention further discloses a testing method of the adhesive force of the lithium ion battery pole piece. Compared with the prior art, the testing device and method ofthe adhesive force of the lithium ion battery pole piece can rapidly and precisely judge the adhesive force of a pole piece.