The invention relates to the field of architectural construction, in particular to a GRC plate waterproof control construction method and application thereof. The GRC plate waterproof control construction method comprises the following steps that S1, the end portions of the GRC plate are subjected to groove pressing treatment and in-plate pressed grooves in the GRC plate are obtained; S2, a plurality of U-shaped grooves are formed; S3, a plurality of bypass channels are formed; S4, the bypass channels are in lap joint with the U-shaped grooves, and the lap-joint portions of the bypass channelsand the U-shaped grooves are subjected to bonding treatment by adopting adhesion agents; S5, the GRC plate is assembled in-situ, and the U-shaped grooves are buckled into the in-plate pressed groovesafter the GRC plate is fixed; S6, waterproof caulking materials are adopted to carry out waterproof caulking sealing on the outer surface of the GRC plate, and a waterproof caulking sealing layer isobtained; and S7, sealing glue is applied to the outer portion of the waterproof caulking sealing layer and a sealing glue layer is obtained. According to the construction method, the construction process is simplified, the construction period is greatly shortened, and the problem of water linkage at the binding position of the GRC plate is effectively solved.