The invention relates to a portable tester for shale gas and coal bed gas, which is applied to the test of content of the coal bed gas and the shale gas. A bottom plate is fixed on the lower part in a box body and is parallel to a box bottom; a panel is fixed at an upper opening of the box body; a cylindrical barrel is fixed on the upper plane of the bottom plate and is vertical to the bottom plate; springs are uniformly distributed and welded and fixed on the top of the cylindrical barrel and are vertical to the end face of the cylindrical barrel; a top plate is fixed on the tops of the springs; the panel is provided with a round hole; the top plate is arranged on the upper part of the panel; the bottom of a closed tank is welded on the upper plane of the top plate; the top of a variablefrequency alternating current motor is welded on the lower plane of the top plate; and the variable frequency alternating current motor is arranged in the cylindrical barrel. The invention has the advantages that: the portable tester is used for hermetically grinding a coal and shale sample in the experiment process and prevents the sample from being oxidized by air, an exhaust pipe is connected with a burette with scales through a rubber pipe, gas released after the coal or shale sample is ground into powder can be collected by the burette, and the gas content of coal and shale is quickly tested.