The invention relates to a GOOSE mode network low frequency load reduction method based on digital transmission network, wherein a part of outgoing line loads is removed according to given tripping runs and the changing of frequency, whole low frequency load reduction function is jointly completed by interval layer devices of different protected objects, a bus control unit is responsible for low frequency logical decision, a discriminant result is transmitted to various outgoing line control devices (dispersion execution units) in the mode of GOOSE signals through digital network, and an intelligent switch is driven by a control unit to trip and remove the loads to complete the whole logical function. Collected analog quantity is transferred to the control device by using IEC61850 standard SMV service message, and a discriminant logical result is transferred by using a GOOSE channel. The whole low frequency load reduction function can be directly used in a digital substation which is built based on IEC61850.