NOVELTY - A coal-base carbon molecular sieve comprises soluble compound, coal raw material, and adhesive agent; where it is prepared by: (a) uniformly mixing the soluble compound, coal raw material, and adhesive agent with water, pressing into strips and drying; (b) carbonizing the dried mixture in inert atmosphere; (c) activating the carbonized mixture by using at least one gas of the vapor and carbon dioxide; and (d) using the hydrocarbon capable of decomposing carbon element as bore adjusting agent to bore-adjust the activated mixture, and obtaining the coal-base carbon molecular sieve.    USE - The coal-base carbon molecular sieve is useful for industrial and commercial applications.    ADVANTAGE - The coal-base carbon molecular sieve has better property of adsorbing methane and separating nitrogen/methane and nitrogen/carbon dioxide. Moreover, the process for preparing the coal-base carbon molecular sieve has abundant preparation raw material and cheap price.    DETAILED DESCRIPTION - A coal-base carbon molecular sieve comprises soluble compound, coal raw material, and adhesive agent; where it is prepared by: (a) uniformly mixing the soluble compound, coal raw material, and adhesive agent with water, pressing into strips and drying, and obtaining the dried mixture; (b) carbonizing the dried mixture in inert atmosphere and obtaining the carbonized mixture; (c) activating the carbonized mixture by using at least one gas of the vapor and carbon dioxide, and obtaining the activated mixture; and (d) using the hydrocarbon capable of decomposing carbon element as bore adjusting agent to bore-adjust the activated mixture, and obtaining the coal-base carbon molecular sieve. An INDEPENDENT CLAIM is a method for preparing the coal-base carbon molecular sieve comprising: (a) uniformly mixing the soluble compound, coal raw material, and adhesive agent with water, pressing into strips and drying, obtaining the dried mixture; (b) carbonizing the dried mixture in inert atmosphere, obtaining the carbonized mixture; (c) activating the carbonized mixture by using at least one gas of the vapor and carbon dioxide, obtaining the activated mixture; and (d) using the hydrocarbon capable of decomposing carbon element as bore adjusting agent to bore-adjust the activated mixture, and obtaining the coal-base carbon molecular sieve.