M-xylene adsorbent and preparation method therefor

An m-xylene adsorbent, comprising 94 to 99.9 wt % of a Y molecular sieve and 0.1 to 6 wt % of a matrix, wherein;

• the Y molecular sieve consists of a non-crystal-transformed Y molecular sieve and a Y molecular sieve produced by a crystal transformation,
• the non-crystal-transformed Y molecular sieve is a mesoporous nano Y molecular sieve,
• the mesoporous nano Y molecular sieve has a crystalline grain size of 20 to 450 nanometers, contains two types of mesoporous pores having most probable pore diameters of 5 to 20 nanometers and 25 to 50 nanometers, respectively, and has a specific surface area of 740-1000 m2/g, a total pore volume of 0.40-0.65 cm3/g and a mesoporous pore volume of 0.08-0.35 cm3/g.