The invention belongs to the technical field of high voltage flexible direct current transmission system key equipment numerical modeling methods, in particular to a numerical modeling method for a mixed type direct current breaker, and is applicable to +/-500kV mixed type direct current circuit breaker modeling. The method comprises the following steps of mechanical switch branch modeling, solid switch branch modeling, buffer branch modeling, timing sequence setting, buffer branch RC and stray parameter analysis. Compared with the prior art, the method has the advantages that the performance characteristics of the mixed type direct current breaker are analyzed in detail, on the basis of the performance characteristics, the influence of different branch stray parameters on the circuit breaker operation process is analyzed, and compared with existing circuit breaker performance characteristic analysis, more comprehensive circuit breaker operation time sequence and current transfer process influence factors can be obtained.