The invention discloses a dynamic regulation method and system for on-line recharging. The method comprises the following steps that: an on-line recharging client side sends user recharging information comprising user account information and recharging amount information to a recharging server, wherein the recharging server comprises a recharging system and a supplier management system; the recharging system receives the user recharging information and sends an acquisition request for a supplier which provides recharging service to the supplier management system; after the supplier management system receives the acquisition request, a supplier list is provided for the recharging system, wherein one or a plurality of suppliers in the supplier list are ranked by the supplier management system according to scoring parameters; and the recharging system carries out a recharging traction by selecting a supplier according to rankings in the provided supplier list, and returns recharging traction result information to the supplier management system. The dynamic regulation of the on-line recharging can be realized through the invention.