Heterojunction cell, preparation method and photovoltaic module

The invention relates to a heterojunction cell, a preparation method and a photovoltaic module, and belongs to the technical field of solar cell manufacturing. The heterojunction cell comprises a monocrystalline silicon wafer substrate; a first amorphous/microcrystalline thin film layer, a first TCO thin film conducting layer, a first metalized grid line, a first metalized main grid protection layer and a first compact thin film layer are sequentially arranged on the light receiving surface of the monocrystalline silicon wafer substrate, and the first metalized grid line comprises a first metalized main grid and a first metalized fine grid; a second amorphous/microcrystalline thin film layer, a second TCO thin film conducting layer, a second metalized grid line, a second metalized main grid protection layer and a second compact thin film layer are sequentially arranged on the backlight surface of the monocrystalline silicon wafer substrate; and the second metalized grid line comprises a second metalized main