The invention provides a series-parallel DC power grid starting method for large-scale long-distance offshore wind power integration. The method comprises steps: 1, an LCC converter is controlled to charge a VSC converter; 2, a wind generating set is integrated to an offshore wind farm one by one; and 3, the LCC converter is controlled to work in an inverter state, and operates in parallel with the VSC converter. Compared with the prior art, the series-parallel DC power grid starting method for large-scale long-distance offshore wind power integration provided by the invention is simple and easy to operate, the economic performance is good, and a small-scale AC starting power supply at a long-distance offshore wind farm side is not needed.