The invention discloses a breaker failure protection blocking method which is used for solving the technical problem that when a circuit branch breaks down, failure voltage blocking constant value sensitivity does not exist in bus breaker failure protection. The breaker failure protection blocking method comprises the following steps that a bus protection device is used for calculating the scalar value and the scalar sum of zero sequence currents of all circuit branches and monitoring the failure opening state of the circuit branches, and as for the circuit branches with failure starting connection points being conducted, a zero sequence current threshold value and a zero sequence rate criterion judgment are met, three continuous sampling points are met, and a breaker failure protection blocking component is opened. Compared with the prior art, the breaker failure protection blocking method has the advantages that judging is carried out according to the relation among the zero sequence current and the negative sequence current formed after single-phase or two-phase failures of a system happen and zero sequence currents and negative sequence currents of the other branches, failure protection maloperation is prevented, the situation that only the single electric factor of a voltage serves as the breaker failure protection blocking component is avoided, and the sensitivity and reliability of the breaker failure protection blocking component are improved.