The invention discloses an efficient preparing method for high-purity flaxseed 
protein. The efficient preparing method comprises the following steps that firstly, defatted 
flaxseed meal is taken, dried and ground, and 
flaxseed meal powder is obtained; secondly, the 
flaxseed meal powder is taken and evenly mixed with 10-30 folds (v / m) of a NaCl solution, and extracting is carried out; thirdly, a 
flaxseed powder extracting solution is centrifuged, residues are removed, and supernatant is obtained and is a crude flaxseed 
protein extracting solution; fourthly, the concentration of NaCl of the crude flaxseed 
protein extracting solution is regulated to be 0.02-0.05 mol / L, then the crude flaxseed protein extracting solution is added into finely-mixed 
zwitterion exchange resin, and stirring is carried out until the change range of the pH value is smaller than 0.2; fifthly, a NaOH solution with the pH being 9-11 is used for washing the 
zwitterion exchange resin; sixthly, a NaCl solution with the pH being 4-6 is used for washing the 
zwitterion exchange resin, and a flaxseed protein extracting solution is obtained; seventhly, 
drying is carried out, and the high-purity flaxseed protein is obtained. By means of the method, flaxseed protein can be effectively extracted, the extracting rate is high, the technological steps are simple, cost is low, and the prepared flaxseed protein is very high in purity and good in effect.