The invention relates to the technical field of renewable energies and in particular discloses a method for pretreating a lignocellulose raw material and application. According to the method disclosed by the invention, with an aqueous ethylenediamine solution as an basic reagent for pretreating the lignocellulose raw material, heating reaction is carried out in a sealed vessel, so that lignin effectively degrades, and the enzymatic hydrolysis conversion efficiency of cellulose to glucose is improved; meanwhile, after the pretreated lignocellulose raw material is washed, the content of impurity is obviously lower than that of impurity in the traditional pretreating process.