Although fabrication of various fullerenols as agronanozymes has undergone remarkable expansion through employing various approaches, there is a lack of knowledge regarding the understanding of metallic-ion-free fullerenols. A feasible preparation technology to fabricate metallic-ion-free fullerenols was developed by heating-treatment oversaturated fullerene using H 2 O 2 solution in o-dichlorobenzene. It was characterized as C 60 (OH) 36 •9H 2 O by various measurements. Maize exposure of 50 mg/L C 60 (OH) 36 •9H 2 O was investigated to significantly enhance growth traits, including seed germination and seedling growth. Additionally, through the integration of ESR spectrum, radical scavenging assay, and peroxidase-like catalytic performance in vitro, DAB staining to visualize the accumulated H 2 O 2 content in vivo as well as investigating the activation of antioxidative performance, it offers insights into the combinational action mechanism of C 60 (OH) 36 •9H 2 O on crop growth regulation. C 60 (OH) 36 •9H 2 O directly scavenged accumulated H 2 O 2 and indirectly activated the antioxidant system to suppress the H 2 O 2 accumulation that acts like peroxidase activity. The present study gives an updated knowledge on synthesizing metallic-ion-free fullerenols with particular emphasis to their application as potential peroxidase-like nanozymes for regulatory roles in the improvement of crop growth.