The invention discloses a ship shore power box with an external power supply function. The shore power box comprises a box body, wherein an external three-phase electric interface, a distribution board interface, a circuit breaker, a first fuse, a second fuse, a first contactor, a second contactor and a universal change-over switch are arranged in the box body, the external three-phase electric interface is connected with the circuit breaker, the circuit breaker is connected with the first contactor, the first contactor is connected with the distribution board interface, the external three-phase electrical interface is further connected with the first fuse, the first fuse is connected with the universal change-over switch, the distribution board interface is further connected with the second contactor, the second contactor is connected with the circuit breaker, the distribution board interface is further connected with the second fuse, and the second fuse is connected with the universal change-over switch. The shore power box is advantaged in that the bidirectional power supply function is realized, the shore power can be received, and a generator of the shore power box can be usedfor supplying power to other ships through the shore power box.