The invention discloses a washing plate used for an evaporation technique and an evaporation technique method which adopts the washing plate; the single surface of the washing plate is provided with adhesiveness; the evaporation technique method includes: providing an evaporated body and a mask used for evaporation as well as includes the washing plate the single surface of which has adhesiveness; a first material membrane is thermally evaporated on the first position of the evaporated body by an opening hole on the mask by a stepless mode; the mask is cleaned by the contact of the washing plate and the surface of the corresponding evaporated body; a second material membrane is thermally evaporated on the second position of the evaporated body by an opening hole on the mask by the stepless mode. Under the premise of not changing an evaporation device, the invention effectively and essentially removes the impurities remained on the mask used for evaporation, thereby reducing the defective rate of the evaporated product; besides, the mask is washed by a plurality of times; the service life thereof can be reduced and the precision thereof can also be reduced as well. Based on ensuring the cleanliness of the mask, the invention reduces the washing times as possible so as to improve the service life thereof.