The invention discloses a silicon heterojunction solar battery and a manufacture method thereof. The silicon heterojunction solar battery includes a crystalized silicon substrate; a first non-crystalized silicon layer, a front electrode layer and a front grid line arranged on the light incoming side of the crystalized silicon substrate successively; a first interconnection strip welded or bonded to the front grid line; a second non-crystalized silicon layer, a first transparent conducting oxide film and a silver film arranged on the backlight side of the crystalized silicon substrate successively; and a second interconnection strip welded or bonded to one side, away from the crystalized silicon substrate, of the silver film. Compared with a prior structure in which a back grid line is arranged on a back electrode layer of a silicon heterojunction solar battery, the back grid line made of silver paste is saved and the second interconnection strip is welded or bonded on the silver film directly. In this way, the manufacture process of the silicon heterojunction solar battery is simplified and the manufacture cost of the silicon heterojunction solar battery can also be reduced.