The invention relates to a method for preparing a spice salt for curing low-salt flavored salted preserved duck. The method comprises the following steps: 1) pulverizing a mixed spice of flos caryophylli, star anise, galangal, liquorice root, pepper and netmeg, sieving through a 10-60-mesh sieve, adding an ethanol solution, the weight of which is 10 to 30 times the weight of the spice powder, soaking at 30 to 80 DEG C for 2-5 hours, and carrying out pressure filtration, so as to obtain spice extract liquid; 2) adding the spice extract liquid, the weight of which is 1 to 6 times the weight of salt, into the salt, separately adding beta-cyclodextrin, the weight of which accounts for 2% to 10% of the weight of the salt, and maltodextrin, the weight of which accounts for 2% to 10% of the weight of the salt, into the salt, heating for concentrating, recovering ethanol, and heating while stirring until moisture is totally dried and the material is completely crystallized, so as to obtain a spice salt cocrystallized embedding material; and 3) crushing and sieving through a 30-mesh sieve. The method can effectively prevent the loss of anti-bacteria and antioxidant components in spices, active components can be evenly distributed on the surface of a duck body along with the salt and the salt penetrates into the duck body fast, the surface of the duck body has no fines of spices and doesnot need to be cleaned, and thus the standardized green production of low-salt flavored salted preserved duck is easy to be realized.