Construction method for bottom joint of prefabricated outer wall

The invention relates to a prefabricated shear wall bottom joint treatment method which comprises the following steps: pouring a concrete construction joint according to design and specification requirements, vibrating and compacting until the concrete construction joint reaches a specified curing age; the joint surface of the construction joint is cleaned, the construction joint is chiseled inwards by a certain width, and scum, sticky dirt, stabs and other obstacles on the surface of the construction joint are completely removed; uniformly mixing the polymer cement elastic waterproof film; the construction joints are densely filled and embedded, and after the construction joints are completely dried, putty is applied twice along the construction joints; a waterproof film is smeared for the first time, then alkali-resisting glass fiber gridding cloth is laid in a wet mode, the net face of the alkali-resisting glass fiber gridding cloth is spread and flattened, and after a period of time, the waterproof film i