A phenol-free coated sand is characterized in that the coated sand is prepared from silicon sand, phenol-formaldehyde resin, urotropine, calcium stearate and macromolecular substances containing amino groups. The preparation method comprises the following steps of: (1) heating the silicon sand to 140 to 160 DEG C; (2) adding the phenol-formaldehyde resin and additives; (3) adding aqueous solutionof the urotropine; (4) adding the calcium stearate; and (5) sieving to obtain the phenol-free coated sand. The phenol-free coated sand has the advantages that a material for reducing the content of free phenols and improving sand core performance is the reaction resultant of the macromolecular substances containing amino groups and the free phenols, which is an intermediate substance with a certain chemical reaction activity and can crosslink with each other to form macromolecules in hot curing reaction for core manufacture or formation. The macromolecules have infusibility and melting resistance, good thermal stability, no phenol volatilization and less production of smoke, and can increase the strength and the toughness of sand core or sand mold and improve the melting point of the coated sand by a certain degree, thus greatly improving the performance of the sand core.