The invention discloses a concrete formwork. The concrete formwork comprises a formwork body, lugs used for splicing are arranged at the two ends of the formwork body, and splicing holes are formed in the lugs; a plurality of inserting holes are formed in the formwork body, hole molds are inserted into the inserting holes, and the outer sides of the hole molds are in threaded connection with the inserting holes; a containing cavity is formed in each hole mold, a plurality of first liquid outlets communicated with the side walls of the hole molds are connected to the side surfaces of the containing cavities, and a first pipeline connecting port is formed in the bottom of each containing cavity; a sodium gluconate solution is injected into the containing cavities after cement is poured, so that solidification of the cement on the outer walls of the hole molds is slow. By means of the concrete formwork and a concrete pouring method, the formwork is convenient to demould, and the demoulded hole molds are very convenient to clean because the cement has not solidified yet.