The invention relates to a relay protection system for a double-power-supply integrated power distribution network station. The relay protection system comprises a double-power-supply power distribution network station, a first bus integrated station protection device and a second bus integrated station protection device, wherein a first incoming line current transformer, a second incoming line current transformer, a sectionalized bus current transformer, a first bus outgoing line current transformer, a first incoming line switch, a second incoming line switch, a sectionalized bus switch and a first bus outgoing line switch are all connected with the first bus integrated station protection device; and the first incoming line current transformer, the second incoming line current transformer, the sectionalized bus current transformer, a second bus outgoing line current transformer, the first incoming line switch, the second incoming line switch, the sectionalized bus switch and all second bus outgoing line switches are all connected with the second bus integrated station protection device. Through adoption of the relay protection system, the floor area can be saved effectively; faults can be cleared rapidly; extension of accidents is prevented; and the protection sensitivity is improved.