The invention discloses a method for synthesizing a magnetic nano titanium silicalite molecular sieve at low cost, and relates to the technical field of molecular sieve material preparation. An aqueous solution of a cheap template agent, an alkali source and a silicon source are mixed and stirred at normal temperature to obtain a colorless transparent mixed solution A; a mixed solution B containing a titanium source and isopropyl alcohol is slowly added into the mixed solution A, and then seed crystals are added to obtain a mixed solution C; after the mixed solution C is subjected to ageing for 1-5 hours at 30-50 DEG C, magnetic cores are added, the mixture is heated to 50-100 DEG C at the speed of 2 DEG C/min, alcohol is removed until the mixed solution C completely becomes powder D, andthe powder D is placed in a small crucible made of polytetrafluoroethylene, and then the small crucible is placed in a crystallization kettle with a polytetrafluoroethylene lining; water is added intothe kettle, then the kettle is placed in a drying oven at a constant temperature for static crystallization, and a crystallization product E is obtained; magnetic separation washing and vacuum dryingare carried out on the crystallization product E, and then the crystallization product E is calcined. The method for synthesizing the magnetic nano titanium silicalite molecular sieve at low cost issimple, high in yield and low in preparation cost.