The invention relates to a workability regulating agent of an alkali-activated salic inorganic coating material as well as a preparation method and application of the workability regulating agent. The workability regulating agent is prepared by mixing a retarding component, a water reducing component, a workability retention component and a de-foaming component. On the premise that unit water consumption is not remarkably increased, the initial viscosity number of the alkali-activated salic inorganic coating material can be significantly reduced; in a construction environment at 5-50 DEG C, the initial viscosity number of the alkali-activated salic inorganic coating material regulated within 10h is not lost or slightly lost, i.e., the workability regulating agent disclosed by the invention can achieve the real-time regulation on the workability of the alkali-activated salic inorganic coating material according to the characteristics of an engineering field, and the workability regulating agent is free from adverse influence on the binding performance and endurance performance of the inorganic coating material.