The invention relates to a semi-automatic three-phase synchronous drop-out fuse, and relates to electric power appliances. The fuse comprises three sets of bar-shaped ceramic column insulators 1, an installation plate assembly 2, an upper static contact assembly 3, an upper movable contact assembly 4, an arc extinction pipe 5, a fuse wire 6, a lower movable contact assembly 7, a lower static contact assembly 8, a connecting rod fixed clip 9, a connecting rod push rod 10, a drop-out buckle 11, a connecting rod 12, a link bar 13 with a hand grip and a windproof wind lock 14. In the semi-automatic three-phase synchronous drop-out fuse, structures of an upper movable contact, a lower movable contact, an upper static contact and a lower static contact are improved, and the service life of the fuse wire is prolonged, so that the fuse wire is durable in use; the fuse is provided with a fuse wire box and the windproof wind lock, a push-up three-phase automatic switching-in structure is simpler, more compact, easily and quickly switched in, reasonable in design, easy to manufacture, low in cost and convenient to use, and the aims that three phases drop out synchronously when one phase is fused, and the three phases are switched in synchronously when a switch is pushed up once can be fulfilled; and the semi-automatic three-phase synchronous drop-out fuse can be widely applied to all outdoor transformers.