The invention discloses a gas-containing coal similar material and a preparation method thereof. The similar material is prepared by the preparation method comprising the following steps: selecting coal powder with certain particle size distribution and a sodium humate aqueous solution as raw materials, wherein the coal powder is used as an aggregate and the sodium humate aqueous solution is used as a cementing agent; weighing the coal powder with the certain particle size distribution, water and sodium humate strictly according to proportions, fully stirring uniformly, pouring the well mixed and stirred mixture into a steel mold, and performing pressure molding on the mixture by using a certain pressure under a press machine; and separating the mold, taking out a molded test piece, and drying at normal temperature or in a drying box. A physical mechanical parameter test shows that the volume weight and porosity of the similar material are equivalent to those of raw coals, the adsorptivity of the similar material is very close to that of the raw coals, and the similar material has the advantages of high uniaxial compressive strength, wide mechanical parameter variation range and the like, and also has the advantages of simple material manufacturing process, stable performance, low price, no toxic or side effect and the like.