The invention discloses a reactive voltage steady-state control method based on multi-FACTS element coordination control. The method comprises the steps of determining a dominant node of a power gridin a control area; determining a control unit of the dominant node; allocating participation factors of control groups according to sensitivity of reactive output of the control units to a bus voltagechange of the dominant node; using the participation factor to participate in calculating a reactive power control quantity of each control unit, and obtaining an adjustment variable according to theobtained reactive power control quantity of each control unit; and adjusting and controlling a reactive voltage of each control unit by using an adjustment variable to reach a steady state. A problemof unstable reactive voltage operation of multi-FACTS element coordination control in the prior art is solved.