A bird inhabitation prevention device comprises a fixed board arranged on a cross arm, anti-bird thorns arranged on the fixed board, and spring buckles used for fixing the fixed board on the cross arm of an electric power tower, wherein buckle fixing grooves for positioning the spring buckles are formed in the upper end of the fixed board, the anti-bird thorns are arranged at intervals, and the buckle fixing grooves are respectively arranged between two adjacent anti-bird thorns. Due to the fact that the spring buckles are positioned on the fixed board of the bird inhabitation prevention device, the spring buckles are absorbed through magnetism, and then installation hooks absorbing the spring buckles are detachably connected to an insulating rod. After the existing insulating rod is conveyed to the cross arm, the fixed board can be positioned on the cross arm by pulling the insulating rod downwards. The bird inhabitation prevention device is simple and safe to operate, can be reused, can carry out hot-line operation, is convenient and reliable to install, eliminates the situation of power failure, largely improves social benefits, and lowers application cost.