Solar cell and grid line structure thereof

The utility model discloses a grid line structure of a solar cell, which comprises a front grid line and a back grid line, the front grid line comprises a front main grid line and a front auxiliary grid line which are perpendicular to each other, the front auxiliary grid line is arranged at an interval and forms a first gap and a second gap, the first gap is internally provided with a front anti-breaking grid line, and the second gap is internally provided with a back anti-breaking grid line. The second gap is not internally provided with a front anti-breaking grid line, and the front anti-breaking grid line is arranged between two adjacent front main grid lines; the back grid lines comprise back main grid lines and back auxiliary grid lines which are perpendicular to each other, the back auxiliary grid lines are arranged at intervals and form a third gap and a fourth gap, the third gap is internally provided with a back anti-breaking grid line, the fourth gap is not internally provided with a back anti-break