A joint type clamping dental floss apparatus comprise a rod, a handle and a joint. The longitudinal section of the rod has a structure with I-shaped, L-shaped and arc-shaped types, two tail ends of the rod are respectively provided with a projecting part screw, the top of the screw is provided with at least one hole penetrating in different directions, and the screw is in threaded connection with a nut. The top of the handle is provided with a g projecting part groove, at least one cavity is arranged in the handle, the opening of the cavity is at the bottom of the handle, a cover is detachably connected with the opening of the cavity, the cover is provided with at least one hole penetrating up and down, the outside of the cover is movably connected with a small cover for covering the hole of the cover, and a dental floss cutting device is fixedly connected to the inside of the small cover. The joint is a regular octagonal column, eight side surfaces and two bottoms of the joint are respectively provided with a groove, a screw thread is arranged in the groove, and the screw is in threaded connection with the screw in the rod and the screw in the handle. Dental proximal different directions can be cleaned in a humanized flexible manner; the dental floss can be replaced in a circulating manner, and the position and the quantity of the clamping dental floss can be adjusted; and the combination form of members can be changed to reach suitable use.