The utility model relates to a flow guide chamber for testing the tight reservoir seam net flow guide capacity through gas. The flow guide chamber can be fused with an API flow guide capacity tester, so that the cost is saved; stone such as real stratum shale or real tight sandstone is used, so that the formation lithology is simulated relatively truly, damage of propping agent embedding to the flow guide capacity is considered, and the crack width and the seam net structure are variable; the flow pattern of the flow guide chamber is radial flow rather than linear flow, the linear flow cannot guarantee that testing media pass all cracks in a seam net, the spread range of the testing media can be improved through the radial flow, and the testing accuracy of the flow guide capacity is improved.