The invention discloses a novel mixing homogenous phase porous sampling valve. A valve body is provided with a flow passage hole and a valve seat ring, the inlet end of the flow passage hole and the interior of the valve seat ring are provided with a two-stage axial cyclone blade type mixer, a blade type fairing is arranged behind the two-stage axial cyclone blade type mixer, the lower end of the valve rod is connected with the upper end of a conical hole plate valve plate at the middle of the upper flow passage hole of the valve body, the valve rod is sheathed with a valve rod nut, the upper and lower parts of the valve rod nut are respectively sheathed with a thrust bearing, the exterior of the valve body is sheathed with a valve cover, the valve body and the valve cover are sealed by a valve cover sealing ring, the valve rod and the valve cover are sealed by a valve rod sealing ring, and an inward-extending type oblique cutting porous sampling pipe is arranged in a screw hole at the downstream side of the valve body, and is sealed by a sampling pipe sealing ring. The sampling valve has the advantages that the variable range of the multi-phase fluid quantity is sufficiently utilized, the collected sample has the same composition as the multi-phase fluid in the pipeline, and can represent the properties of the multi-phase fluid in the pipeline, and the mixing and rectifying homogenous phase parts can be detached for cleaning or replacing.