The invention relates to the accumulated snow depth detection technology, and particularly relates to a high-precision automatic infrared snow condition detection device, which solves the problem that the existing accumulated snow depth detection method is high in manual cost and large in labor intensity, continuous real-time and automatic detection at the same place can not be carried out, environmental influences are large, and an inner formation and disappearing process of a snow layer in the case of melting can not be reflected. The high-precision automatic infrared snow condition detection device comprises a triangular prism body, a supporting steel pipe, three rectangular coverless box bodies, three rectangular PCBs, three infrared transmitting and receiving arrays and three rectangular organic glass boards; the lower end surface of the triangular prism body is provided with a central concave hole; the upper end of the supporting steel pipe is inserted in the central concave hole; the outer box bottoms of the three rectangular coverless box bodies are respectively fixed on three side surfaces of the triangular prism body; and the back surfaces of the three rectangular PCBs are respectively fixed on the inner box bottoms of the three rectangular coverless box bodies. The device of the invention is applied to accumulated snow depth detection.