NOVELTY - Attapulgite clay-nickel (Ni)/iron (Fe) nanocomposite material comprises attapulgite clay, where nickel and/or iron grains having grain diameter of smaller than 20 nm are loaded on crystal surface of attapulgite whose diameter is 40-50 nm.    USE - Attapulgite clay-Ni/Fe nanocomposite material used to absorb and catalytically crack tar (claimed) or to catalytically crack and purify thermal gas tar in biomass gasification furnace and catalytically crack other organic materials.    ADVANTAGE - The attapulgite clay-Ni/Fe nanocomposite material has low activating capability, high catalytic activity, and strong carbon deposit resistance capability.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a preparation method of attapulgite clay-Ni/Fe nanocomposite material comprising:    (A) pre-piling and homogenizing attapulgite clay raw material;    (B) adding water into piled and homogenized attapulgite clay raw material; adjusting moisture content of attapulgite clay raw material at 30-50 mass%; cutting and squeezing by pair-roller and multi-roller squeezers into attapulgite clay sheets; and depolymerizing and dispersing the crystal bundles of attapulgite;    (C) drying the attapulgite clay sheets and crushing to make attapulgite clay powder, which can pass through 200-mesh sieve;    (D) adding 100 g attapulgite clay powder in 200-2000 ml water; aging for 10-48 hours and stirring for 0.5-1 hour to obtain homogenous pulp of attapulgite clay; adding 1-20 g diffluent nickel salt and/or 1-50 g diffluent iron salt into the pulp; continuously stirring until there is no more bubbles; and adding in 1-10 mass% sodium hydroxide solution until the pH of suspending liquid is 6-10; and fully hydrolyzing the added nickel ions and/or iron ions;    (E) washing and dehydrating the suspending liquid into slurry cake, pelletizing, and drying; drying the slurry cake and crushing and sieving to obtain particulate materials with required grain diameters; or washing and dehydrating the suspending liquid into slurry cake, adding in soupy starch (1-5 mass%), stirring and homogenously mixing, and pelletizing and drying to obtain particulate materials with required grain diameters; and    (F) putting particulate materials in tubular furnace; pouring hydrogen and reducing hydrogen at 400-700 degrees C; transforming hydroxide colloidal particles of Fe and Ni, which are loaded on surface of attapulgite, into nanometal grains until there is no more condensed water produced in gas pipeline; and obtaining attapulgite composite material loaded with Ni and/or Fe metal nanograins.