The invention provides a hybrid DC circuit breaker. The hybrid DC circuit breaker comprises a support rack, a first mechanical switch, a second mechanical switch, a power electronic switch, a first positive terminal, a second positive terminal, a first neutral terminal, a second neutral terminal, a third neutral terminal, a fourth neutral terminal, a first negative terminal and a second negative terminal, wherein the first positive terminal and the second positive terminal form a positive path, the first neutral terminal and the second neutral terminal form a first neutral path, the third neutral terminal and the fourth neutral terminal form a second neutral path, the first negative terminal and the second negative terminal form a negative path, the power electronic switch is used for disconnecting the positive path when electric energy of the positive path is larger than a first threshold and disconnecting the negative path when the electric energy of the negative path is larger thana second threshold, the first mechanical switch is used for disconnecting the positive path and the first neutral path when the electric energy of the positive path is larger than a third threshold, and the second mechanical switch is used for disconnecting the negative path and the second neutral path when the electric energy of the negative path is larger than a fourth threshold. By the hybrid DC circuit breaker, the disconnection speed of the circuit breaker can be improved, and the volume of the circuit breaker is reduced.