The present invention relates to an 
inflatable device for producing 
hydrogen, in particular to an anti-
scalding, safe, low-pressure, environment-friendly 
hydrogen machine and gas preparation method for inflating toy balloons and advertising balloons. The 
hydrogen machine of the present invention includes: a liquid inlet  , reactor, purifier, 
check valve, gas-water mixing cooler, gas-water separator and 
sewage storage tank. During the preparation process, the reaction liquid is injected into the reactor through the liquid inlet, and the occurrence of the reaction is controlled through the liquid 
inlet valve.  And stop, purify and preliminarily cool the foam-containing crude hydrogen product prepared by the reactor through the purifier, further cool the pure hydrogen through the gas-water mixing cooler, and finally use the gas-water separator to obtain hydrogen and cooling water  Separation to achieve the purpose of 
aeration. The hydrogen produced by the invented hydrogen 
machine has high purity and good 
aeration effect. At the same time, the reaction residual liquid can be collected and reused, which greatly reduces 
energy consumption and 
material consumption, making the entire preparation process economical, reasonable, 
environmentally friendly and safe.