Abstract: In order to explore the potential of coconut shell biochar in improving soil fertility and promoting crop growth,and further provide theoretical support for the application of forestry wastes in agriculture, this study took rice as the object, and through pot experiments, the mass fraction of 4 % applied coconut shell biochar, and used soil without biochar as the control group to analyze The effects of coconut shell biochar on the growth indexes（plant height, biomass, leaf relative chlorophyll content） and soil physicochemical properties（pH, redox potential, total organic carbon, dissolved organic carbon, inorganic nitrogen, sulfate,ferrous iron, total iron, organic matter, total nitrogen, total phosphorus, total potassium and available nutrients） of rice at the heading stage and maturity stage. The results show that:（1） Coconut shell biochar significantly promoted the growth of rice and improved photosynthetic capacity.（2） Coconut shell biochar significantly improved the physical and chemical properties of the soil. The soil pH at the heading stage and maturity stage increased from 7.05 and 7.16 to 7.27 and 7.20, respectively. The redox potential increased by 30.56% and 190.88%, respectively. The total organic carbon content increased significantly from 2.83% and 2.66% to 6.70% and 6.32%, respectively, and the organic matter content increased from 36.37 g/kg and 33.58 g/kg to 71.49 g/kg and 70.70 g/kg, respectively.（3） Coconut shell biochar significantly improved soil fertility, and increased soil total nitrogen, total phosphorus, available phosphorus and available potassium content.（4） Correlation analysis shows that soil nitrogen, phosphorus and potassium contents are significantly correlated with physical and chemical indicators such as pH, redox potential, nitrite,ferrous iron, organic matter, sulfate, total iron, total organic carbon, and dissolved organic carbon.