NOVELTY - A portable hydrogen gas generator comprises body containing hollow reaction chamber (11) which has material inlet and gas outlet (13), where the material inlet allows reaction solution and metal material to be filled into the reaction chamber to perform chemical reaction and generate hydrogen gas; gas-pressure detecting unit for detecting status of gas pressure in the reaction chamber; reaction solution detecting unit for detecting status of reaction solution in the reaction chamber; and gas-dispatching unit (40) for exporting hydrogen gas generated in the reaction chamber.    USE - A portable hydrogen gas generator.    ADVANTAGE - The generator has a reaction solution concentration meter that allows the user to monitor the consumption of the reaction solution. This also allows monitoring of waste solution whether the waste solution is completely discharged to prevent the residual waste solution from affecting the efficiency of subsequent reactions. During reaction of the aluminum and the reaction solution, the user can also monitor the reaction velocity through the reading of the thermometer, and perform necessary adjustment of the reaction velocity to prevent or avoid potential danger. Different reaction velocity of hydrogen gas generation can be provided by preparing the aluminum metal in different forms, thus adjustment is simple convenient. The hydrogen gas generator is easy to be carried and transported.    DETAILED DESCRIPTION - A portable hydrogen gas generator comprises a body containing a hollow reaction chamber (11) which has a material inlet and a gas outlet (13), where the material inlet allows a reaction solution and a metal material to be filled into the reaction chamber to perform a chemical reaction and generate hydrogen gas; a gas-pressure detecting unit for detecting status of gas pressure in the reaction chamber; a reaction solution detecting unit for detecting status of the reaction solution in the reaction chamber; and a gas-dispatching unit (40) for exporting the hydrogen gas generated in the reaction chamber. The gas-dispatching unit comprises a connecting device (45) connected to an external apparatus that consumes hydrogen gas for operation including a fuel cell or a welding machine. The gas-pressure detecting unit comprises a gas-pressure meter (21) communicated with the reaction chamber for exhibiting the gas pressure in the reaction chamber, and automatic pressure-relieving device (22). The reaction solution detecting unit comprises a thermometer for exhibiting temperature of the reaction solution.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a portable hydrogen gas generator in operation.    Hollow reaction chamber (11)    Gas outlet (13)    Gas-pressure meter (21)    Automatic pressure-relieving device (22)    Gas-dispatching unit (40)    Connecting device (45)