The invention relates to high-temperature well cementing cement and high-temperature well cementing cement grout. The high-temperature well cementing cement comprises cement clinker and gypsum, wherein the cement clinker comprises the following mineral components in percent by weight: 30-40% of tricalcium silicate, 45-60% of dicalcium silicate, 1-4% of tricalcium aluminate and 10-20% of tetracalcium aluminoferrite. Through optimization and matching of the mineral composition of a cement base material, the contents of the tricalcium silicate, the dicalcium silicate, the tricalcium aluminate andthe tetracalcium aluminoferrite as cement components are adjusted, so that the hydration progress of the cement better meets the high-temperature well cementing need; the high-temperature well cementing cement can effectively solve the problem of decay of high-temperature strength of set cement in deep and ultradeep well cementing engineering; the preparation method is simple and easy to obtain,can replace the existing high-temperature well cementing cement and the existing well cementing cement grout system can be replaced; the structural durability and the structural safety in high-temperature complex deep well cementing engineering are facilitated.