The invention relates to a forming die for a formwork member. The die comprises a side die surface (1) and a bottom die surface (2) which surround to form the forming die and is characterized in that: the side die surface (1) and the bottom die surface (2) of a female die are integrated; the integrated side die surface (1) and bottom die surface (2) do not need to be split in a die releasing process and are released integrally; at least one ejection device (3) passing through the die surface is arranged in the female die; and the side die surface (1) of the female die is provided with a die releasing taper beta relative to the bottom die surface (2), wherein beta is between 1 and 60 degrees. The female die has high integrity and is difficult to be deformed and damaged; the ejection device is arranged, so that the die is very easy to release from the formwork member and the formwork and the die are not damaged; and simultaneously, the die releasing taper is set, so that the formwork and the die are loosened and separated easily by the ejection device, the attrition rates of the formwork and the die are decreased greatly and cost is lowered.