The invention provides a bird-repellent device. The bird-repellent device comprises a dispelling unit arranged on a cross arm of a pole, and a solar panel for supplying power to the dispelling unit so that the dispelling unit can generate acoustic and light dispelling signals. Due to the sound and light combination effect, stimulation is caused to the auditory sense and vision sense of birds so that the birds can avoid the dispelling unit, the probability that the birds stay on an erected electric line is reduced, and the bird-repellent function is achieved. Light can be used for illumination and accordingly does not influence human beings. A certain safety distance always exists between the erected electric line and a house, so sound waves are used on the erected electric line to dispel the birds and do not harm human beings. Therefore, the bird-repellent device has the advantages of being high in safety, environmentally friendly and good in bird-repellent effect.