A method for plastering construction in architectural decoration comprises the following steps: (1) base treatment; (2) applying mortar on the wall surface according to the required plastering depth, and longitudinally installing screeding templates along a wall surface subjected to the base treatment in Step (1) according to the plastering depth, a lateral space between adjacent screeding templates being 1.3 to 1.8 meters; (3) plastering; and (4) laying aside the wall surface subjected to the plastering for 12 to 24 hours till plastering mortar on the wall surface is in a half-dried compact hardened state, and using teeth of a saw blade for grinding the mortar along the two adjacent screeding templates through a ruler till the mortar is even. The method can improve the construction efficiency and guarantee the construction quality.