1. An image processing method applied to printer screening plate-making technology, characterized in that the method includes: generating a stochastic screening dither matrix T; a value of each data item i in the stochastic screening dither matrix T being t i , and t i ε[0,255], iε[0,W T −1], wherein W T is the number of data items in the stochastic screening dither matrix T; subtracting a positive-negative conversion factor δ from the value t i of each data item i in the stochastic screening dither matrix T, to obtain a difference value rt i corresponding to each data item i, and δε[0,255], and replacing the original value t i of each data item i with the difference value rt i ; generating a screen dot dither contrast matrix CT j for each color surface of n color surfaces of an image according to the difference value rt i and a stochastic screening dither threshold F j set for each color surface, wherein F j ε[0,127], jε[1,n]; and performing a logical “and” operation between each data item in a one-bit amplitude modulation screen dot matrix of each color surface of the image and a data item at a corresponding position in the screen dot dither contrast matrix CT j of the color surface respectively, and replacing a value of a corresponding data item in the one-bit amplitude modulation screen dot matrix with a resultant value of the logical “and” operation, to obtain a processed one-bit amplitude modulation screen dot matrix for each color surface of the image.