A method for evaluate that malfunction risk of relay protection caused by excitation inrush current comprise the following steps: under the condition that the designate operation worker and each parameter information is fully available, establishing a protection model with complete parameters according to topological zero-sequence network combined with specific parameters to calculate the malfunction risk probability of zero-sequence protection of transformer; When the transformer is put into operation and the single parameter information is missing, the protection model with single parameterinformation missing is established to calculate the probability of zero-sequence protection malfunction when the single parameter is missing. When a transformer is put into operation and the missing parameters are two or more than two parameters, a multi-parameter missing protection model is established to calculate the failure probability of the i-th zero-sequence protection under each group of remanence parameters, and the comprehensive weighted probability of the failure risk assessment of the zero-sequence protection under different groups of remanence parameters is obtained. Whether the transformer can be put into operation or not is judged according to the calculated risk probability of zero-sequence protection malfunction of the transformer. The invention solves the problem of evaluating the risk of malfunction caused by transformer airdrop.