The invention relates to a protection system, in particular to a relay protection system of an integrated power distribution network station and belongs to the technical field of relay protection of power systems. According to the technical scheme provided by the invention, the relay protection system of the integrated power distribution network station comprises a power distribution station, wherein the power distribution station comprises an incoming line, a bus connected with the incoming line and a plurality of outgoing lines connected with the bus; the incoming line is provided with an incoming line current transformer and an incoming line switch; each outgoing line is provided with an outgoing line current transformer and an outgoing line switch; the incoming line current transformer and the outgoing line current transformers are connected with an integrated station protection device; and the integrated station protection device is connected with the incoming line switch and the outgoing line switches. The relay protection system is compact in structure, safe and reliable; the floor area can be effectively reduced; a fault can be quickly removed; expansion of a fault is prevented; and the protection sensitivity is improved.