Provided is an anti-slipping device for dual tires including: a plurality of spike members 100 which comprises an insertion plate 110 bent in a trapezoidal shape to be inserted between the dual tires, and close-contact plates 120 integrally extending from opposite sides of the insertion plate 110 to closely contact each surface of the dual tires; a belt 200 connecting the insertion plates 110 of the plurality of spike members 100 to each other; and a fastener 300 coupled to opposite ends of the belt 200 to adjust tension of the belt, wherein the fastener 300 includes first and second connection rings 330a and 330b each inserted into insertion space parts 201a and 210b formed at both ends of the belt 200, and a belt fastener 340 detachably coupled to the first and second connection rings 330a and 330b to adjust tension of the belt 200, thereby stably providing running performance and braking power to minimize a risk of a slipping accident.