The present invention discloses a metal grid line electrode of a silicon heterojunction solar cell and a silicon heterojunction solar cell. The metal grid line electrode comprises: a main grid line; afirst group of secondary grid lines comprising a plurality of secondary grid lines arranged in parallel, wherein the first group of secondary grid lines are perpendicular to and intersected with themain grid line; a second group of secondary grid lines comprising a plurality of secondary grid lines arranged in parallel, wherein the second group of secondary grid lines are parallel to the main grid line and intersected with the first group of secondary grid lines. The metal grid line electrode is small in the shielding of the action surface of the battery light and low in resistance, and canachieve good balance between the current collection and the electrode shading so as to improve the performances of the solar cell.