Disclosed is a light string with replaceable decorative covers, which relates to the technical field of light strings. The decorative light string includes multiple decorative lights, and each of the decorative lights includes a lamp base, a light emitting unit, a lamp shade, a lamp holder, and the decorative cover, where the decorative cover can be detachably mounted on the lamp shade, which allows the decorative cover to be located on a luminous side of the light emitting unit and thus makes it fully illuminated when the light emitting unit emits light. The light string has the advantages of being simple in structure, convenient and fast to disassemble and assemble, and good in decorative effect.