The invention belongs to the field of DC control and especially relates to a multi-DC frequency limiter regulating according to a regulation capability size order. Multiple DC lines are connected to one frequency limiter. The frequency limiter acquires a total regulation volume of the multiple DC lines through responding to system frequency and allocating the total regulation volume to the DC lines according to the regulation capability size of the DC lines, so that a fact that DC participation into frequency regulation is as less as possible is ensured and only one DC line participates into regulation at a single moment. Therefore, maintenance of system frequency stability is facilitated.