The invention provides an intelligent liquid supply method and system for a fully-mechanized coal mining face. The method includes the steps of acquiring the estimated action and estimated action timeof a support of the fully-mechanized coal mining face; obtaining a liquid supply demand according to the estimated action of the support, and obtaining a flow demand and/or a pressure demand according to the liquid supply demand in combination with the current moment and the estimated action time; outputting a control signal corresponding to the flow demand and/or the pressure demand before the estimated action time. Emulsified liquid can be provided for the support according to the amount of emulsified liquid needed by the action which the support is about to execute, so that demand-based liquid supply is realized; besides, as the liquid supply action is responded to before the estimated action time, the needed emulsified liquid can be provided for the support in time, and time delay isavoided.