The invention provides a plant conservation device. The plant conservation device comprises a conservation barrel, a coil improvement seat and a conservation clothes, wherein the conservation clothes comprises a tubular connection seat and a cono-cylindrical sheath which are fixedly connected, and two ends of the conservation clothes are respectively connected with the conservation barrel and the coil improvement seat during use. The plant conservation device can provide nutrients needed for initial-stage growth for transplanted arbor and shrub seedlings, water saving and moisture conservation effects are realized, the transplanting or cutting survival rate of arbor and shrub seedlings can be guaranteed under the high cold condition, and the stable condition is provided for slope plant communities.