A method for image recognition of an instrument includes: obtaining an input image containing a to-be-recognized instrument selecting from the input image a region-of-interest containing the to-be-recognized instrument determining in a high-to-low order of priority values of instrument categories, whether the to-be-recognized instrument contained in the region-of-interest belongs to one of the instrument categories according to the region-of-interest and a respective one of plural groups of sample images and increasing the priority value of the one of the instrument categories when it is determined that the to-be-recognized instrument belongs to the one of the instrument categories.
