The invention relates to a 
fiber / CNT(carbon 
nano tube) / MgFe2O4 three-dimensional recyclable efficient catalytic material, as well as preparation and application thereof. A three-dimensional continuous structure is constructed on the surface of 
textile fiber by CNTs, and surfaces of the CNTs are loaded with nano MgFe2O4. Preparation comprises: soaking 
fiber in a dispersion liquid containing CNT compound MgFe2O4 and 
polyethylene glycol 2000, lasting reaction for 2-4 h at 60-80 DEG C, 
drying, washing with water, repeating processes of soaking, 
drying and washing with water for 3-5 times, and obtaining the material. The fiber / CNT / MgFe2O4 three-dimensional recyclable efficient catalytic material is low in cost, the preparation method is simple, requirements on equipment is are low, and the 
operability is good; a 
water treatment agent provided by the invention can remove high-concentration organic pollutants in water, is suitable for advanced treatment of various 
wastewater, protects the environment, avoids secondary 
pollution, and has the advantages of being antibacterial, removing 
odor, absorbing other heavy 
metal ions, and the like.