Photovoltaic cell and preparation method thereof

The invention relates to the technical field of photovoltaics, in particular to a photovoltaic cell and a preparation method thereof. A photovoltaic cell comprises a silicon wafer and grid lines. Grid lines are formed on the surface of the silicon wafer; the grid line is of a structure that a shell wraps an inner core; the inner core comprises a silver-copper slurry layer, and the shell is a pure silver slurry layer; the core contacts with the surface of the silicon wafer, and the shell completely covers the exposed surface of the core; or the shell is in contact with the surface of the silicon wafer and completely covers the exposed surface of the inner core. According to the photovoltaic cell, the grid line is of the structure that the shell wraps the inner core, the silver-copper slurry layer serves as the inner core of the grid line and serves as a main body for transmitting current of the whole grid line, consumption of silver slurry is effectively reduced, the cost is reduced, and the electrical perform