An embodiment of the invention discloses a voltage conversion circuit used for RFID (radio frequency identification). The voltage conversion circuit comprises a low dropout regulator, a 3.3V working module, a voltage domain converter and a 5V working module, the low dropout regulator is used for converting working voltage from 5V to 3.3V, the 3.3V working module is connected with the LDO and used for converting analog signals input to the 3.3V working module into digital signals, the voltage domain converter is connected with the 3.3 V working module and used for converting the working voltage between 3.3V and 5V, and the 5V working module is connected with the voltage domain converter and used for receiving the working voltage of 5V and receiving digital signals output by the 3.3V working module. Power consumption of the voltage conversion circuit can be lowered substantially without lowering signal quality, and utilizability is high.