The invention relates to a gas-solid separator, in particular to a gas-solid separator which is fixed in a pneumatic delivery pipeline for direct gas-solid separation and which is applied to gas-solid separation of materials easy to break during pneumatic conveying, and belongs to the technical field of pneumatic conveying equipment. The gas-solid separator is provided with a conveying mesh belt disposed in the pneumatic delivery pipeline. When air flow carrying solid material encounters the conveying mesh belt, gas and powder pass through the conveying mesh belt and enter a tail gas treatment system; the solid material is filtered by the conveying mesh belt and conveyed to a discharge chamber; in the discharge chamber, the material on the conveying mesh belt loses support of the air flow below and adsorption of negative pressure above, is separated from the conveying mesh belt under the action of self-gravity, and falls to a discharge hole along a parabolic path under the motion-directional inertial action of the conveying mesh belt so that gas-solid separation is complete. No traditional airlock discharger is used for discharging, so that the problem that application value of the material decreases since the solid material is broken and lessened by mechanical friction of the material is avoided.