The invention discloses a CaMg2-based alloy hydride hydrolysis hydrogen production material and a preparation method and application of the CaMg2-based alloy hydride hydrolysis hydrogen production material. The general formula of the CaMg2-based alloy hydride hydrolysis hydrogen production material is CaMgxMyHz, wherein M is Ni or Co or Fe, 1.5<=x<2.0, 0<y<=0.5, and 3<=z<6. The preparation method of the material includes the following steps that first, three kinds of pure metal blocks are stacked in a crucible, wherein the M metal block is arranged on the top; second, the crucible is installed in a high-frequency induction melting furnace, vacuumization is performed, and argon is introduced; third, the high-frequency induction melting furnace is started, low-power heating is first performed, and then, the power is increased so that the metal blocks can be evenly molten; the crucible is cooled along with the furnace, alloy ingots are obtained, and CaMg2-based hydrogen storing alloy is obtained after the alloy ingots are smashed through a hammer; fourth, the alloy ingots which are smashed through the hammer are hydrogenated, and the hydrolysis hydrogen production material is obtained. The preparation method is simple, cost is low, the material can absorb hydrogen at normal temperature and is good in hydrogen absorbing performance, and prepared hydrogen is pure and can be directly introduced into a hydrogen fuel cell for use.