The invention relates to a spring winding device for manufacturing infinite-long springs. The spring winding device comprises a winding shaft, a winding part which can revolve around the winding shaft is arranged at the periphery of the winding shaft, a wire penetrating hole for spring wires to penetrate through is formed in the winding part, a chain which can revolve around the winding shaft is arranged beside a winding wheel, and the winding wheel and the chain can rotate synchronously. By means of the technical scheme, the spring winding device has the following advantages of being very simple in equipment structure, few in part and capable of achieving continuous infinite spring production when materials are supplied continuously when being compared with the prior art.