The invention provides a power grid side energy storage power station frequency voltage protection method. The method comprises the following steps of step 1, introducing a three-phase current of a grid-connected point into a control and protection device; and step 2, modifying frequency voltage protection action logic of the control and protection device, wherein through the three-phase alternating current is introduced into the frequency voltage protection device, an active and reactive locking function output by an energy storage station is introduced into the frequency voltage protection logic so that a frequency voltage protection is more triggered from a protection system and a correct action is timely performed. The protection method introducing the active and reactive locking function is especially suitable for a power grid side energy storage power station with dual attributes of a power supply and a load.