The invention provides a frequency divider capable of configuring any integer and half-integer and a method using the same, belonging to the technical field of digital frequency division. The frequency divider comprises a mode selection and output part, a configuration data latching part and a frequency division counter part, and is characterized in that the mode selection and output part is connected with the configuration data latching part and the frequency division counter part respectively. The method by using the frequency divider comprises the following steps: 1, starting; 2, inputting frequency division coefficients and mode selection signals; 3, applying effective reset signals, and latching the frequency division coefficients and the mode selection signals; 4, inputting signals to be subjected to frequency division, running the frequency divider, and outputting the frequency division signals; and 5, judging whether the frequency division coefficients or the frequency division modes need to be changed. According to the invention, a frequency division function of any integer or half-integer can be realized; when the integer is subjected to frequency division, equal duty ratio frequency division signals and unequal duty ratio frequency division signals can be output in accordance with requirements; and the frequency division coefficients of the frequency divider and the duty ratio of the output signals can be adjusted based on conditions, thus improving the flexibility of the frequency divider and expanding applicable range of the frequency divider.