High-strength cement-based self-leveling mortar

The invention discloses high-strength cement-based self-leveling mortar powder and slurry. The mortar powder specifically comprises the following components in parts by weight: 25-27 parts of silicate cement, 5-10 parts of aluminate cement and/or sulphate aluminium cement, 5-8 parts of gypsum and a very small amount of aids, wherein the very small amount means that the weight of every single additive accounts for 0.05-0.5wt% of the total weight of the mortar powder. According to the mortar disclosed by the invention, the mortar body added with water in proportion is good in peaceability, and during the construction time, good flowability can be continuously maintained, and the loss is less; the mortar is high in hardening speed, and after 6-8 hours, people can walk on the mortar; the mortar is high in strength and can be used as a heavy load floor cushion. The self-leveling mortar product is good in workability, hard to crack in construction at a low temperatures (5-10 DEG C) and convenient to store.