The invention relates to a temporary hole sealing device used for deck rainwater prevention. The temporary hole sealing device structurally comprises a double-thread screw (1), a fixing support (2), adjustable supporting feet (3), a sealing board (5), sealing rubber (4) and a special nut (6). One adjustable supporting foot (3) is screwed in each of four supporting feet (21) of the fixing support (2). The lower portion of the double-thread screw (1) penetrates through an open hole to be screwed into a center screw hole (23) of the fixing support (2). The open hole is covered with the sealing board (5). The upper portion of the double-thread screw (1) penetrates through a center sleeve hole (53) in the sealing board (5). The special nut (6) is fixed to the upper portion of the double-threadscrew (1). The annular sealing rubber (4) is arranged between the sealing board (5) and a deck. By the adoption of the temporary hole sealing device used for deck rainwater prevention, the hidden danger that in the ship construction process, water enters a cabin, thus the construction schedule is affected, and electrical equipment is damaged can be avoided, the construction quality and the construction period of products are guaranteed, and safety risks of field operation are reduced.