The invention relates to a three-port hybrid direct-current circuit breaker, and belongs to the technical field of power electronics. The three-port hybrid direct-current circuit breaker comprises a main circulation branch, a transfer branch and an energy consumption branch, wherein the main circulation branch is connected in parallel with the transfer branch; the main circulation branch comprisesthree branches connected in parallel; two groups of mechanical switches are connected in series to each branch; each group of mechanical switches comprises at least one mechanical switch; and seriesconnection points of the two groups of mechanical switches of each branch are correspondingly connected with the three output ends of the three-port hybrid direct-current circuit breaker. The three-port hybrid direct-current circuit breaker can provide independent three ports for a direct-current system and is used for connecting a current converter and two direct-current lines; the function of the three-port hybrid direct-current circuit breaker is equivalent to the function of three traditional single-port hybrid/mechanical direct-current circuit breakers; and the equipment cost is reduced by about more than 40%, the cost is greatly reduced, the occupied area and the usage amount of the direct-current circuit breaker can be reduced, and the running stability of a direct-current power grid is improved.