The invention discloses a method for degrading by an iron/copper bimetal oxide. Peroxy-monosulfate is activated by adopting the iron/copper bimetal oxide to generate a sulfate radical free group; an iron/copper bimetal heterogeneous oxide is a granular compound of copper oxide and ferric oxide; a surface has massive pores and cracks; in a catalytic activation process, the tetracycline is degradedby the sulfate radical free group generated when the peroxy-monosulfate is coupled with Fe(III)/Fe(II) and Cu(II)/Cu(I) on the surface of an iron-copper bimetal oxidation catalyst; a degradation process is simple, and the degradation efficiency is high.