A wire binding device comprises a body. A groove is formed in one side of the body. A handle is installed at the other side of the body. A support is fixedly installed at the two sides of the groove of the body. A sliding groove is formed in the support. A pulley is connected with the support. The two ends of the pulley are located inside the sliding groove. One end of the support is connected with a limiting block. A groove is formed in the middle of the limiting block. The wire binding device has the advantages of improving the speed and the quality of binding and winding of wires and preventing a zinc stamping layer on each iron wire from being damaged when the wires are bound.