The invention discloses a miniaturized rubidium atomic frequency standard radio-frequency circuit, comprising a voltage-controlled crystal oscillator. The voltage-controlled crystal oscillator is connected with a direct digital synthesizer and a frequency mixer. The direct digital synthesizer is connected with the frequency mixer via an operational amplifier. The frequency mixer is connected with a step recovery diode via a first crystal filter, a first radio-frequency amplifier, a second crystal filter and a second radio-frequency amplifier in order. The direct digital synthesizer is connected with a single-chip microcomputer. Unwanted frequency is prevented from being introduced and entering a microwave cavity in the frequency mixing step of a radio-frequency chain. Frequency conversion loss which may be caused due to the frequency mixing step of the radio-frequency chain is avoided, and signals that enter a microwave resonant cavity are increased. With a simple structure, the circuit is easy to debug and helps miniaturization of rubidium atomic frequency standard. The crystal filters have many advantages in terms of frequency selectivity, frequency stability, transition-zone slope, insertion loss and the like, and achieve relatively good filtering effect.