The invention discloses a smartphone address book fuzzy search method including preprocessing data of contacts recorded in a smartphone address book, acquiring spelling of names of the contacts and corresponding digital sequences of a thumb keyboard according to a spelling code table, writing the key information including the spellings, the digital sequences, phone numbers and the like into a memory while backing up the key information to a designed buffer, respectively matching different fields of the contacts in the memory on the basis of three classifications by judging whether including Chinese characters, letters or numbers according to the given search keywords, and finally realizing fuzzy matching of the keywords and the spellings of the names by a modified character string sequence matching algorithm. By the smartphone address book fuzzy search method, the address book can be searched globally according to optional keywords, the digital search of the thumb keyboard is supported, names, full spellings, shorthand spellings, part spellings, phone numbers, mailboxes of the contacts can be in fuzzy search, the search results can be output in a weighted ranking manner according to specific matching reasons, and accordingly, the smartphone address book fuzzy search method is a convenient and efficient diversified operating method for users.