The application discloses a dual power bustransceiver with low dropout linear voltageregulator, a voltage conversion circuit and a display system. The dual power bustransceiver with low dropout linear voltageregulator comprises a first power pin for connecting a first power supply, a second power pin for connecting a second power supply, at least one first pin electrically connected to the first power supply and leading to an input port, at least one second pin electrically connected to the second power supply and leading to an output port, a third pin, a voltage conversion module comprising at least one voltage conversion unit, an input end of the voltage conversion unit being connected to the first power supply, an output end of the voltage conversion unit being connected to the second power supply, and a low dropout linear voltage regulator connected to the third pin.