The invention provides a method for identifying an infrared picture and a visible light picture by utilizing wavelength information. The method comprises the following steps: S1, acquiring initial image data of pictures; S2, traversing each pixel of the picture; S3, calculating the infrared characteristic value of the picture according to the following formula: a set m1 of pixels in the picture is equal to {n1, n2,...}, each pixel is n and comprises three color values of r, g and b, n is equal to {r, g, b}, then calculating x, and when r>=b>=g is possible, xi=1, and when r>=b>=g is impossible, xi=0, then calculating the average value of x, wherein i is a positive integer, and the value is an infrared characteristic value; and S4, distinguishing the infrared picture data and the visible light picture data according to the infrared characteristic value.