The invention discloses an RVDT conversion circuit comprising an RC bridge oscillation circuit, a push-pull output circuit, a rotary transformer digital converter and a peripheral circuit thereof. According to the RVDT conversion circuit and the electronic controller, the RC bridge type oscillation circuit is used for generating an excitation signal and is capable of providing stable excitation signals for an oil needle position sensor and a throttle lever position sensor, thereby ensuring normal working of the oil needle position sensor and the throttle lever position sensor. The push-pull output circuit is used for driving the oil needle position sensor and the throttle lever position sensor. The rotary transformer digital converter and the peripheral circuit thereof are used for collecting displacement signals for driving the oil needle position sensor and the throttle lever position sensor, converting the displacement signals to digital signals, and then transmitting the digital signals to a single-chip microcomputer. According to the invention, the RVDT conversion circuit is integrated with signal excitation, driving and signal conversion functions; and the circuit integrationdegree is high, the circuit structure is simple, and the cost is low.