A rapidly-assembled lamp with a detachable lamp rod and lamp seat is disclosed. The lamp seat has a penetrating hole at a position coupled to a via hole of the wire winding box. A side of the penetrating hole is formed with a slot. At a middle section of an inner periphery of the penetrating hole has an annular groove for buckling the lamp rod. A portion of the lamp rod is protruded with a positioning key. A C ring has a tapered shape so as to have a lager diameter opening which exactly protrudes from the surface of the lamp rod. After the lamp rod is inserted into the lamp seat, the inserting portion is inserted into the inserting seat so that the lamp seat is electrically conductive. Thereby, the lamp is detachable for storage and transfer with a smaller volume.