Preparation method of double-sided copper-clad plate

The invention provides a preparation method of a double-sided copper-clad plate. The preparation method comprises the following steps: preparing a single-sided copper-clad plate comprising a copper foil and a directional polymer insulating layer; carrying out activating treatment on a film forming surface with a directional polymer insulating layer of the prepared single-sided copper-clad plate; stacking the two activated single-sided copper-clad plates, wherein a certain included angle theta degrees exists between the same directions of the directional polymer insulating layers belonging to the two single-sided copper-clad plates respectively; and laminating the two stacked single-sided copper-clad plates to obtain the double-sided copper-clad plate. The preparation method of the double-sided copper-clad plate, provided by the invention, is simple in process, economical and efficient, can prepare the high-frequency and high-speed double-sided copper-clad plate with isotropy, and solves the problem of non-uni