The invention relates to a steel-plastic combined fuse of an artificial precipitation projectile, which comprises a fuse body, a side ignition mechanism, a time delay self-destruction mechanism and an auxiliary detonator. The side ignition mechanism and the time delay self-destruction mechanism are installed on the upper part of the inner bore of the fuse body, the auxiliary detonator is installed at the lower part of the inner bore of the fuse body; the fuse body is combined by the fuse steel body at the lower part and the cast plastics at the upper part; the side ignition mechanism comprises an ignition base, the position beyond the center of the ignition base is provided with a groove; the time delay self-destruction mechanism comprises a middle priming tube, in which 611 pieces of miniature smoke gunpowder are equipped, the pressing quality of which is 53-58mg. The invention solves the problems of large quantity of residual fractions after the full explosion of artificial precipitation projectiles, the incomplete explosion, misfire, and the like existing in the artificial precipitation projectiles.