The invention discloses a preparing method and application of an environment-friendly carbon quantum dot/CTF-T1 immobilized type visible light catalyst containing no heavy metal, and belongs to the technical field of material preparation and photocatalysis. CTF-T1 is prepared with a liquid-phase synthesizing method, then carbon quantum dots are immobilized on CTF-T1, and the carbon quantum dot/CTF-T1 immobilized type visible light catalyst is formed. The light catalyst prepared with the method contains no heavy metal, has good water photolysis hydrogen generation performance, and has large utilization potential.