Recovery method of coal bed gas

The invention discloses a recovery method of coal bed gas. The recovery method comprises the following steps that step (1) the coal bed gas extracted from a coal bed gas well is made to penetrate through the interior of a desiccator equipped with desiccants, and drying and water removing processing is carried out on the coal bed gas; step (2) the coal bed gas obtained after processing of step (1)is made to penetrate through a primary efficiency filter, and primary filtration processing is carried out on the coal bed gas; step (3) the coal bed gas obtained after processing of step (2) is madeto penetrate through a high efficiency filter, and fine filtration processing is carried out on the coal bed gas; and step (4) the coal bed gas obtained after processing of step (3) is imported into astorage tank for storage. According to the recovery method of the coal bed gas, coal dust and water vapor can be removed from the coal bed gas after the coal bed gas is extracted, and the processingoperation such as subsequent