The invention provides a symbol input method and a symbol input system. The method comprises the following steps of performing encoding to a symbol according to the natural language name to obtain the mapping relationship between an identification code of the symbol and a natural language code; receiving the input symbol of the natural language code, and obtaining an identification code of the mapped input symbol according to the mapping relationship; and obtaining and displaying the symbol according to the identification code. The symbol input system comprises a mapping module and a display module, wherein the mapping module is used for acquiring the identification code of the mapped input symbol according to the mapping relationship; and the display module is used for acquiring and displaying the symbol according to the identification code. The symbols can be rapidly and effectively input by a user with a familiar natural language through the keyboard keys, so that the problems of low input efficiency, high learning difficulty and poor learning difficulty during the process of inputting the symbols in the prior art are solved.