1. A method for processing a block to be processed of a urine sediment image, comprising: dividing a block to be processed into a plurality of grids according to a predetermined division rule; calculating an n-dimensional local feature vector of each grid of the plurality of grids, where n is a positive integer; in the block to be processed, according to a predetermined merging rule, merging at least two adjacent grids of the plurality of grids into an intermediate block; according to the n-dimensional local feature vectors of the grids contained in the intermediate block, calculating an intermediate block merging feature vector of the intermediate block; according to a predetermined combination rule, combining the intermediate block merging feature vectors obtained for different intermediate blocks of the block to be processed into a general combination feature vector of the block to be processed; and by way of taking the general combination feature vector as a feature in a feature set of block processing, processing the block to be processed.