The invention relates to a protective circuit with IGBT valve banks connected in series. The protective circuit comprises at least two IGBT valve banks which are connected in series; two ends of the collector-emitter electrode of each of the IGBT valve banks in series connection are connected with clamping circuits in parallel; each clamping circuit comprises a stabilivolt and a lighting arrester. The method in which two ends of the collector-emitter electrode of each of the IGBT valve banks in series connection are connected with the clamping circuits in parallel is simple and reliable, has a remarkable effect, and can be used for effectively solving the problem of nonuniform voltage in the case of short circuit of IGBTs in series connection and realizing the uniform voltage in the turn-off process in the case of short circuit of IGBTs in series connection, thus effectively protecting IGBT from the overvoltage breakdown phenomenon.