A quick data search apparatus, search method, adding method and deletion method. By means of an implementation method of three times of HASH algorithm with a small-capacity CAM, the problem that the implementation solution of large-capacity quick search is single is solved, the problem that the capacity is small when quick search is realized by means of an FPGA, the problem that a large amount of memory space is occupied when the bit width of a data word is very large is solved, and the beneficial effects of simple implementation, large capacity and quick search speed of data search are achieved. In another aspect, by means of replacing the storing of a data word with the storing of a Hash value of the data word, where the bit width of a data word is very large, the memory space occupied by the data word can be saved. The present invention can be widely applied in various data search systems.