NOVELTY - A vehicle-mounted microwave plasma reformer system comprises a controller (1001), a power supply regulator (1019), a microwave generating magnetron (1020), a waveguide (1021), a coaxial transmission device (1022), a resonant cavity (1018), a heat exchanger (1007) and an evaporator (1008). The controller controls the flow rate and microwave power of the fuel and water. The power supply regulator is used for adjusting the microwave magnetron. The microwave generating magnetron converts the electric energy into microwave frequency of 2.45 GHz.    USE - Vehicle-mounted microwave plasma reformer system for online hydrogen production.    ADVANTAGE - The system has simple structure, and can automatically start.    DETAILED DESCRIPTION - A vehicle-mounted microwave plasma reformer system comprises a controller (1001), a power supply regulator (1019), a microwave generating magnetron (1020), a waveguide (1021), a coaxial transmission device (1022), a resonant cavity (1018), a heat exchanger (1007) and an evaporator (1008). The controller controls the flow rate and microwave power of the fuel and water. The power supply regulator is used for adjusting the microwave magnetron. The microwave generating magnetron converts the electric energy into microwave frequency of 2.45 GHz. The resonant cavity is a plasma reactor reformer chamber. The microwave generating magnetron is provided for liquid coolant. The heat through the heat exchanger is transmitted to the liquid fuel and water. The liquid fuel and water enter into evaporator to form steam and enter into microwave resonant cavity. The connecting base is set with spark ignition device of the chemical materials of reformer chamber excited by spark ignition device controller at plasma state. The spark ignition device controls the opening and closing. The resonant cavity is a rectangular structure. The resonant cavity is operating in TE-10p mode, where p=2 or 3. The waveguide is connected with the resonant cavity bottom of the probe feeding transmitter which is set with the largest electric field at a point. The resonant cavity is inserted into the first boron silicic acid glass tube used as the reforming reactor. The boron silicic acid glass tube passes through one end of the first connector and fuel and steam inlet conduit. The other end of the borosilicate glass tube is connected with an exhaust pipe via a connector. The reformed gas through reforming gas outlet duct spark igniter seat connected with a spark ignition device is installed on the wall of the resonant cavity and extends into a borosilicate glass used to start within the plasma generation. Once the plasma generating laser made by the microwave power holding the spark ignition is switched off, the plasma excited state of microwave power and ethanol vapor flow is P-mic(W)=(254.82 (J) divided by 46(g)) and multiplied by R-eth (g/s)=5.54 R-eth, where R-eth is the mass flow rate of the ethanol steam, microwave plasma reformer, the microwave power and ethanol mass flow rate according to the equation of relation to a steam mass flow rate should be accelerated according to mass flow ratio of the alcohol to ethanol to water which is 46:18:2.56.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic diagram of the vehicle-mounted microwave plasma reformer system.    Controller (1001)    Heat exchanger (1007)    Evaporator (1008)    Resonant cavity (1018)    Power supply regulator (1019)    Microwave generating magnetron (1020)    Waveguide (1021)    Coaxial transmission device (1022)