The invention discloses a preparation method for 
atropine sulfate. The preparation method comprises the following steps: 1) adding 
dry powder of daturae flower into 
hydrochloric acid with a concentration of 1 to 4% and a volume 0.5 to 1 time of the volume of the 
dry powder for 
wetting and swelling, then adding the swollen daturae flower 
powder into a percolating 
barrel, adding the 
hydrochloric acid with a concentration of 1 to 4%, dipping the 
powder for 24 h or above and carrying out percolating so as to obtain brown-yellow stiff paste; 2) dissolving brown-yellow stiff paste in 
acetone, adding 
active carbon, carrying out decoloring and filtering, adding acid drop by drop until a pH value is less than 7 and carrying out standing at 
room temperature so as to obtain 
hyoscyamine sulfate; and 3) spreading 
hyoscyamine sulfate on a sample disc, putting the sample disc into a baking oven, carrying out heating for 
racemization, then carrying out cooling to obtain a crude 
atropine sulfate product, adding 
ethanol, carrying out dissolving under stirring and then filtering, subjecting a filtrate to 
crystallization overnight and then successively carrying out pressure-reduced filtering and 
vacuum drying so as to obtain 
atropine sulfate. According to the invention, the daturae flower is used as a 
raw material; 
acid water is used for 
percolation and extraction; total alkali is obtained through 
chloroform extraction; 
sulfuric acid is added into an 
acetone solution for salt forming so as to obtain 
hyoscyamine sulfate, then heating is carried out for 
racemization, and 
ethanol recrystallization is carried out to obtain 
atropine sulfate; and the method is simple in 
process operation, small in 
pollution, low in cost and suitable for industrial production.