An anti-theft structure for a socket display hanger contains a socket display hanger and a fitting seat extending outwardly from a bottom end of the socket display hanger. The fitting seat has two flexible retaining pieces fixed on two sides thereof, two locking projections mounted on two outer walls of the two flexible retaining pieces, an engaging rack defined between the two flexible retaining pieces, two flexible abutting extensions extending outwardly from two sides of the engaging rack, a connecting segment extending upwardly from a top end of the engaging rack and coupling with the socket display hanger, and an arcuate hollow space defined on two sides of the connecting segment and the fitting seat. The fitting seat of the socket display hanger is connected with a square hole of a wrench socket.