Tobacco ephestia elutella protective agent as well as preparation method and use method thereof

The invention discloses a tobacco ephestia elutella protective agent which comprises the following components, by weight: 1 part of cinnamomum camphora leaves, 1 part of wormwood, and 1 part of walnutleaves. The preparation method of the protective agent comprises the following steps: S1, performing crushing; to be specific, selecting clean cinnamomum camphora leaves, wormwood and walnut leaves,and respectively crushing the materials into 50-100-mesh powder; S2, performing soaking; mixing the powder obtained by crushing in the S1, adding clear water for dilution, and soaking the diluted solution for 12-24 hours; S3, performing filtering; to be specific, filtering the soaked diluent, and reserving filtrate to obtain a protective agent; and the use mode of the protective agent is as follows: the protective agent is uniformly sprayed on cloth surface, and then the cloth covers the surface of a cigarette packet, so that one surface of the cloth sprayed with the protective agent is exposed in the air. The obtained