The invention discloses a monolithic integrated ring oscillator and frequency divider circuit, which consists of a ring oscillator and a frequency divider based on direct coupling field effect transistor logic. In a chip, the output end of the ring oscillator is connected with the input end of the frequency divider; after applying direct current voltage to the input end, the ring oscillator oscillates, generates sinusoidal signal and outputs; the output sinusoidal signal is used as the input signal of the frequency divider, and the frequency divider outputs divided radio frequency after normal operation. The invention further discloses a processing method for the monolithic integrated ring oscillator and frequency divider circuit. The adoption of the invention can achieve the purposes of reducing chip area and simplifying test procedure.