Preparation method of electrode and preparation method of solar cell

The invention provides a preparation method of an electrode and a preparation method of a solar cell, and the preparation method of the electrode comprises the steps: providing a semiconductor substrate layer, and forming an auxiliary grid line electrode on at least one side of the semiconductor substrate layer through employing an electroplating technology; a main grid line electrode is formed on the side, where the auxiliary grid line electrode is formed, of the semiconductor substrate layer through the screen printing technology, and the main grid line electrode is electrically connected with the auxiliary grid line electrode. The main grid line electrode is formed through the silk-screen printing technology, and the main grid line electrode has a certain width, can provide a large bonding pad point, provides a good welding pulling force, and facilitates the interconnection of assemblies. The width of the auxiliary grid line electrode formed by the electroplating process is narrower than that of the auxili