NOVELTY - Multi-wall carbon nanotube (MWCNTs) and JUC-32 (Y) coordination polymer composite carbon nanotube material is claimed. The carbon nanotube material is prepared by adding synthesized JUC-32 (Y) coordination polymer in carboxy modified MWCNTs, subjecting JUC-32 (Y) coordination polymer for heteronuclear growth along MWCNTs, coating JUC-32 (Y) coordination polymer on the surface of MWCNTs, where the mass ratio of MWCNTs and JUC-32 (Y) is 1:200-1000.    USE - The composite material is used in gas (e.g. carbon dioxide or methane) adsorption (claimed).    ADVANTAGE - The material improves adsorption efficiency in gas adsorption, and significantly improves unit specific surface area phase adsorption capacity relative to pure JUC-32 (Y) material, and improves material and adsorption gas force adsorption enthalpy.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing multi-wall carbon nanotubes (MWCNTs) and JUC-32 (Y) coordination polymer composite carbon nanotube material, comprising (i) adding carboxy group modified MWCNTs into dimethyl formamide, and ultrasonically dispersing uniformly, (ii) taking MWCNTs dispersed dimethyl formamide solution, where the MWCNTs concentration is 0.02-0.1 mg/ml, then adding deionized water to make the volume ratio of dimethyl formamide and deionized water in reaction system to 5:1, preparing the solution and dividing into two parts, marking solution A and solution B, and (iii) adding yttrium acetate in solution A and stirring to dissolve, adding trimesic acid in solution B, stirring to dissolve, where the mass ratio of MWCNTs and trimesic acid is 1:200-1000, the mass ratio of yttrium acetate and trimesic acid is 2:1, under the stirring condition, dropping solution B into the solution A, to obtain grey white to black emulsion, continuing to stir until the reaction is complete, centrifuging reaction solution, washing product using dimethyl formamide, then drying in the oven, vacuum removing dimethyl formamide and the guest molecules of water, so as to obtain composite material.