The invention discloses a magnetic composite metal organic framework material of a multi-stage structure and a manufacturing method thereof and belongs to the technical field of magnetic metal organic framework materials. The manufacturing method comprises the steps that one or more kinds of metal salt containing ferric chloride and aromatic carboxylic acid ligand are dissolved in high-boiling-point organic solvent according to a certain proportion, and the magnetic composite metal organic framework material, containing superparamagnetic Fe3O4, of the multi-stage structure is further grown in situ through a solvothermal method by controlling the molar ratio of the metal salt to aromatic carboxylic acid and the molar ratio of added ferric chloride and by using proper reducing agents and complexing agents in cooperation. Due to the fact that a Fe3O4 nano magnet and the metal framework material can be combined in situ at the same time, the manufacturing procedure of the magnetic metal framework material is greatly shortened, and the technique is greatly simplified. The novel magnetic composite metal organic framework material of the multi-stage structure can serve as a visible-light-induced photocatalyst for organic pollutants and has potential application value on the aspects of adsorption, separation, biological medicine and the like.