La-Fe-Si base room-temperature magnetic refrigeration composite material and preparing method thereof

The invention discloses a La-Fe-Si base room-temperature magnetic refrigeration composite material and a preparing method thereof. A La-Fe-Si base magnetic refrigeration material and Ce-Co alloy powder are evenly mixed, low-temperature hot press sintering and subsequent high-temperature diffusion heat treatment are conducted, finally, rapid quenching is conducted to the room temperature, and a cylindrical composite magnetic refrigeration material is prepared; and the La-Fe-Si base magnetic refrigeration material is formed by mixing particles with the granularity being 100-300 microns and the granularity smaller than 46 microns. The composite material is composed of a magnetic heat working medium and a bonding agent. On one hand, the material porosity is reduced through the bonding agent, so that good density and excellent mechanical performance are achieved; and on the other hand, bonding agent atoms enter main phase particles through heat diffusion, a large-platform-shaped magnetic entropy change and high-re