An automatic magnetic buckle, which comprises a matching clamping head and a buckle base, wherein the said clamping head comprises a clamping head housing, and the said clamping head housing has a cavity extending through the upper and lower ends of the clamping head housing; the said cavity is set with a buckle subassembly, and the said buckle base is set with a buckle head matching with the said buckle subassembly, and the said clamping head and the buckle base are set with magnetic subassemblies which are mutually attracted, wherein the said magnetic subassembly of the clamping head is set at a lower end of the said cavity, and the lower part of the buckle subassembly is located at the magnetic subassembly of the clamping head; the magnetic subassembly of the said buckle base is set in the said buckle base, and the magnetic subassembly of the said buckle base is located under the buckle head, wherein the said buckle base has a plate shape, and the two ends of the buckle base are respectively set with long-striped webbing slots being respectively set in parallel or wherein the said buckle base is cylindrical, the lower part of the buckle base is set with a metal piece, and the metal piece is set with a long-striped webbing slot; wherein the upper surface of the buckle base is set with a circular groove, the inner diameter of the said circular groove is greater than the outer peripheral diameter of the clamping head housing, and the said buckle head is located in the middle of the said circular groove; and characterized in that the middle of the said circular groove is further set with a receiving groove of magnetic ring, the said magnetic ring being placed in the receiving groove of magnetic ring, and its position is limited by a cover plate at the top of the receiving groove of magnetic ring. comprises a clamping head housing, and the said clamping head housing has a cavity extending through the upper and lower ends of the clamping head housing; the said cavity is set with a buckle subassembly, and the said buckle base is set with a buckle head matching with the said buckle subassembly, and the said clamping head and the buckle base are set with magnetic subassemblies which are mutually attracted, wherein the said magnetic subassembly of the clamping head is set at a lower end of the said cavity, and the lower part of the buckle subassembly is located at the magnetic subassembly of the clamping head; the magnetic subassembly of the said buckle base is set in the said buckle base, and the magnetic subassembly of the said buckle base is located under the buckle head, wherein the said buckle base has a plate shape, and the two ends of the buckle base are respectively set with long-striped webbing slots being respectively set in parallel or wherein the said buckle base is cylindrical, the lower part of the buckle base is set with a metal piece, and the metal piece is set with a long-striped webbing slot; wherein the upper surface of the buckle base is set with a circular groove, the inner diameter of the said circular groove is greater than the outer peripheral diameter of the clamping head housing, and the said buckle head is located in the middle of the said circular groove; and characterized in that the middle of the said circular groove is further set with a receiving groove of magnetic ring, the said magnetic ring being placed in the receiving groove of magnetic ring, and its position is limited by a cover plate at the top of the receiving groove of magnetic ring.