The present application provides an electrochemical device. The electrochemical device, comprising: a positive electrode; a negative electrode; and the separator, disposed between the positive electrode and the negative electrode, wherein the separator comprising a porous substrate, a first coating layer and a second coating layer, the first coating layer and the second coating layer are on a surface of the porous substrate, the first coating layer is disposed on at least one side of the second coating layer, the first coating layer includes a first binder, and the second coating layer includes a second binder, the adhesive force between the first coating layer and the positive electrode or the negative electrode is greater than the adhesive force between the second coating layer and the positive electrode or the negative electrode. The electrochemical device provided by the present application can further improve the cycle performance of the electrochemical device.