The utility model discloses an entry diffuser, it includes cylindric last barrel, go up the top of barrel and install the flange, go up the bottom of barrel and install annular bottom plate, install the conical body in the inner chamber of last barrel, the conical body top is equipped with the apron, the bottom and the annular bottom plate sealing connection of conical body, be equipped with the strip seam on the lateral wall of conical body, the bottom of annular bottom plate is connected with the hollow cylindric top of barrel down, equipartition sideshake seam on the lateral wall of lower barrel, the bottom of barrel is connected with the tapered distribution board that spreads all over garrulous discharge orifice down, be equipped with the discoid liquid board that spatters in the below of conical body in the inner chamber of lower barrel, the periphery that spatters the liquid board is equipped with the triangle -shaped baffle, it passes through the several bracing piece and fixes on the tapered distribution board to spatter the liquid board. The utility model discloses the peak value and liquid phase bias flow degree of liquid phase along radial distribution has been reduced to improve the gas -liquid two -phase feeding cut the areal distribution at the reactor behind entry diffuser even degree, optimized entry diffuser's predistribution performance.