Anti-theft windowsill

The utility model relates to an anti-theft windowsill, which comprises an anti-theft windowsill board and protective steel cables, wherein the anti-theft windowsill board is arranged outside a windowsill of a building and is movably connected with a wall body, iron stabs are arranged on the protective steel cables, one end of each telescopic protective steel cable is fixed on the wall body, the other end is fixed on the anti-theft windowsill board, and the number of the telescopic protective steel cables is at least two. The utility model can play a role of protecting house security, and can also play roles of beautifying living rooms and increasing use areas of the living rooms when people place flowers that people love on the windowsill. The kind of anti-theft windowsill has the advantages of simple production process, low cost and convenient replacement.