The invention discloses a preparation method of a high-aluminum content, alkali-free and 
chlorine-free setting accelerator. The preparation method comprises the following steps: (1), uniformly mixing2-
acrylamide-2-methylpropanesulfonic acid, 
acrylamide, 
acrylic acid, 
sodium hydroxide, an initiator, a crosslinking agent with water to obtain an aqueous phase; uniformly mixing 
cyclohexane with 
sorbitan oleate to obtain an 
oil phase; heating the 
oil phase to 50-70 DEG C, then dropwise adding the aqueous phase, performing a 
polymerization reaction for 5-10 hours, then filtering and 
drying to obtain a 
dissolution promoter; (2), uniformly mixing aluminum 
sulfate, the 
dissolution promoter with water, standing still for 1 h, continuing to add 
alcohol amine, a pH 
regulator and a rheological agent,then heating to 60-80 DEG C, reacting for 3-6 h, and cooling to 
room temperature to obtain the high-aluminum content, alkali-free and 
chlorine-free setting accelerator. According to the preparation method, through use of the 
dissolution promoter, the content of the aluminum 
sulfate is increased; the alkali-free ad 
chlorine-free setting accelerator prepared through modification can greatly improvethe 1d 
compressive strength of 
cement mortar and can improve comprehensive performance, such as the stability and the like, of a product.