The invention discloses a long persistence fluorescence composite filament. The composite filament comprises fluorescent silk and traction silk which are arranged at the piece number rate of 1:(1-2),and the traction silk winds around the outer side of the fluorescent silk; the fluorescent silk is obtained through the following steps that long persistence fluorescent powder and plastic color masterbatch are mixed to be uniform and molten according to the mass fraction of 1:(12-16), the mixture is extruded through an extruding machine, and the long persistence fluorescence composite filament isformed. According to the technical scheme, by means of the long persistence fluorescence composite filament, by adding the long persistence fluorescent powder, the composite filament has the noctilucent function, and silk stockings woven with the composite filament can also have the noctilucent function; compared with the prior art, the long persistence fluorescent powder cannot fall off in silkthreads, and then the noctilucent function can be kept for a long time; in addition, the composite filament is comfortable and close-fitting in wearing and full of beauty; due to the fact that the long persistence fluorescent powder contains multiple chemical substances, in order to avoid the phenomenon that the fluorescent silk makes direct contact with skin, the composite silk winds around the outer side of the fluorescent silk, and the composite filament wraps the fluorescent silk.