The invention discloses an Al-Ga-In-Sn-Cu alloy for hydrogen production, a preparation method of the Al-Ga-In-Sn-Cu alloy and application to fuel cells. According to the Al-Ga-In-Sn-Cu alloy for the hydrogen production, the preparation method of the Al-Ga-In-Sn-Cu alloy and the application in the fuel cells, doping of Cu is used for reducing the amount of precious metals Ga and In, and thus the production cost is lowered; furthermore, the normal growth of Al crystal particles is hindered by introducing the Cu, crystal boundaries are increased, the alloy is embrittled, pulverization of the alloy under hydrolysis reaction is facilitated, and the hydrogen generation performance of an Al-Ga-InSn4 alloy is obviously improved.