Screen printing plate group, screen printing method and preparation method of heterojunction solar cell

The invention relates to a screen printing plate group, a screen printing method and a preparation method of a heterojunction solar cell, and belongs to the technical field of solar cell preparation. Comprising a first silk-screen printing plate for performing primary silk-screen printing by using copper paste and a second silk-screen printing plate for performing secondary silk-screen printing by using silver paste. A screen printing plate group comprises a first screen printing plate and a second screen printing plate, and during screen printing, primary screen printing is performed by using copper paste through the first screen printing plate, and then secondary screen printing is performed by using silver paste through the second screen printing plate, so that front and back metal electrodes are formed; according to the invention, the copper grid lines in the front and back metal electrodes are wrapped by the silver-copper grids, the copper grid lines are completely not contacted with the external environ