▎ 摘　　要

NOVELTY - Preparing nitrogen-doped carbon-loaded iron oxide composite material comprises mixing the water-soluble iron salt, the carbon carrier and water for the first time, and calcining the obtained carbon-iron mixture to obtain the carbon-loaded iron oxide; mixing the carbon-loaded iron oxide with organic nitrogen source and water for the second time, and subjecting obtained carbon-nitrogen mixture to second calcination to obtain the nitrogen-doped carbon-loaded iron oxide composite material. USE - The composite material is useful in photodegradation catalysis. ADVANTAGE - The method: has simple and easy-to-obtain raw materials and simple process, and is suitable for industrialized production. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for nitrogen-doped carbon-loaded iron oxide composite material is prepared by above mentioned method, comprising a nitrogen-doped carbon carrier and iron oxide loaded on the nitrogen-doped carbon carrier; the nitrogen-doped carbon carrier includes a carbon matrix and nitrogen doped in the carbon matrix.