Magnetic recoverable g-C3N4/SnFe2O4 is prepared by a solvothermal method. The g-C3N4/SnFe2O4 shows enhanced photocatalytic activity for chlorotetracycline. The g-C3N4/SnFe2O4 has a larger rate constant than those of g-C3N4 and SnFe2O4. The photocatalytic mechanism of g-C3N4/SnFe2O4 was investigated.