The invention discloses a relay protection method and a relay protection device. The method comprises the following steps: calculating an opposite end compensating voltage according to the circuit distribution capacitance and parallel reactor parameters; acquiring a distant skip signal sent by a teleprotection system, and sending the distant skip signal when an opposite end goes wrong; and judging whether to trip off a local circuit breaker or not after a delay setting time according to the distant skip signal, the calculated opposite end compensating voltage and a preset opposite end voltagesetting value. The method and the device can acquire more accurate relay protection for the local end.