The invention relates to the technical field of building materials, in particular to a high-adaptability wet-mixed mortar additive and a manufacturing process thereof, and the high-adaptability wet-mixed mortar additive is prepared from the following raw materials in parts by weight: 12-15 parts of a thickening agent, 5-8 parts of an air entraining agent, 10-15 parts of a water reducing agent, 10-12 parts of a water-retaining agent, 10-15 parts of a retarder, 8-12 parts of an anti-cracking agent, 4-6 parts of a foam stabilizer and 70-100 parts of water. The additive is reasonable in proportion, simple and convenient in preparation process, high in water retention rate and large in volume weight, the prepared additive is used in mortar to effectively improve the hardening strength of wet-mixed mortar, the adopted water-retaining agent can enable the wet-mixed mortar to still have very good water retention at high temperature, the addition amount can be increased, pumping is convenient when the additive is added into the wet-mixed mortar, the precision of the liquid mortar consistency regulator is easier to control in production, and corresponding adjustment is easier to make according to environmental factors.