The invention discloses a biochar material facilitating carbon cycling. A preparation method of the biochar material comprises steps as follows: 1) mature Ni or/and Ti-enriched plant biomass is dried and crushed; 2) the plant body crushed in step 1 is carbonized into activated carbon in an argon atmosphere; 3) a zinc chloride solution is added and evenly mixed after washing, and microwave radiation and soaking at the room temperature are performed; 4) washing is performed until the pH value of biochar washing water is neutral, and drying is performed; 5) drying is performed, a sodium borohydride solution is dropwise added to reduce ferrous ions to zero-valent iron; 6) the material is dried after being washed, cooled to the room temperature, sealed, heated and cooled to the room temperature, and the biochar material is prepared. The invention further discloses the preparation method of the biochar material. The biochar material can be used for soil improvement.