The invention discloses a joint device capable of meeting the two-way transmission requirement of a digital television, which is a cylinder formed by coiling a sheet metal, wherein the two ends of the cylinder are arranged to be dumbbell-shaped grabhooks which are provided with a thin middle part and two thick ends respectively; the thin part of the dumbbell-shaped grabhook is a clamping groove; a hollow cone of the thick part is a grabhook which is provided with 4 to 12 holes; and the end part of the grabhook is bell-mouthed. The joint device can meet the two-way transmission requirement of the digital television, is convenient, fast and secure to connect, and can make pictures clearer and more stable and prevent noise interference.