The invention discloses a fragrant immobilized granular activation-free chlorine dioxide air purifying agent and belongs to the field of environmental purification. The air purifying agent includes following components: a solidifying agent, a chlorine dioxide generating substance, spices, a coloring agent, a slow-releasing agent, a filling agent and the like. A preparation method includes the steps of material preparation, grinding, drying, sieving, mixing and moulding. The air purifying agent can effectively kill bacteria, virus, chemical toxins and residual pesticides and the like harmful substances. The air purifying agent is convenient to use, is simple in operation, is significant in effects, is long-acting, safe and long-shelf-life, and has wide application prospect in the fields of household environments, medical care and health care, hygiene and epidemic prevention and the like.