The invention discloses an ultrahigh-voltage receiving-end large-power-grid flexible control system based on user intelligent interaction. The system comprises an intelligent scheduling control system, a marketing load control system and a multi-element service integrated load control cloud platform. According to the development status of the power grid in Jiangsu, for the purpose of meeting the requirement for system power balance under the condition of great power loss of an ultrahigh-voltage receiving-end power grid, such technologies as Internet plus, cloud computation, large data and the like are integrated with a power system in an depth manner, and a load flexible control framework based on a virtual power plant and a cloud platform is constructed. The system provided by the invention is suitable for controllable load fine control of an ultrahigh-voltage receiving-end large power grid, can effectively bring the cluster aggregation effect of vast virtual power plant units into play, contributes large power, rapidly recovers the supply-demand balance of power grid power, represents a beneficial supplement to conventional power grid emergency control, realizes and supports safe and stable operation of the power grid and improves power supply quality.