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DC circuit breaker is one of the most important switch devices in power system, Which plays the role of switching control when the system devices enter or exits the system. The connection between the closing/opening coil current and the state of the DC breaker are studied, to diagnosis the DC breaker status. Firstly, the current waveform of the opening and closing coil is collected by the Hall current sensor. Then, analysis the coil current in the DC circuit breaker opening/closing process is analyzed and the time (t1/t2) with current value (i1/i2) of the coil current inflection point are determined as the characteristic values of the diagnosis. and then, the collected current waveform is denoised by low-pass filtering with a cutoff frequency of 15 kHz that is extracted by the method of current envelope. Finally, 80% of the samples were randomly divided into training samples and 20% were test samples. Seven different states of the simulation were diagnosed by SVM. The diagnosis results show that the analysis method based on the current of the coil current can realize the condition monitoring and diagnosis of the dc circuit breaker in traction substation.