The invention discloses a sealing valve cover of a spur gear high-pressure gate valve. The sealing valve cover comprises an annular ceramic cover body; a sealing ring is arranged on the ceramic cover body; multiple rolling shafts are arranged in a top surface recess of the ceramic cover body, and are distributed in a central symmetry form; an annular sealing ceramic piece covers the rolling shafts, and is tightly covered with the ceramic cover body; multiple chutes are formed in the sealing ceramic piece, and are corresponding to the rolling shafts one to one; and the ceramic cover body and the sealing ceramic piece are formed by burning aluminum oxide, strontium carbonate, tin oxide and chromium according to a weight part ratio of 150: 17: 6: 13. The sealing valve cover of the spur gear high-pressure gate valve adopts the matched ceramic cover body and sealing ceramic piece; and the ceramic cover body and the sealing ceramic piece are higher in wear resistance, and cannot generate wear in repeated rotation of a valve rod, so that the sealing performance of the valve cover is greatly improved, and the service life of the spur gear high-pressure gate valve is prolonged.