The invention relates to a carbonaceous organic material pressurized-gasification solid wet deslagging device comprising an upper slag bucket and a lower slag bucket, wherein the top end of the upper slag bucket is provided with a high-temperature ash inlet pipe (17); a jacket pipe (1) is arranged outside the high-temperature ash inlet pipe (17) and provided with a water or low-temperature gas inlet (2); the lower end of the annular gap of the jacket pipe (1) is open; the middle of the upper slag bucket is provided with an upper slag bucket temperature measuring port (6), a liquidometer upper mounting port (3), a liquidometer lower mounting port (5) and a high-pressure water overflow port (4); the high-pressure water overflow port (4) is lower than the liquidometer upper mounting port (3); the lower part of the upper slag bucket is provided with a high-pressure water inlet (7) and a circulating water inlet (8); the bottom of the upper slag bucket is provided with an upper slag bucket slag drop pipe (18) which is provided with a loose water inlet (9); a lower slag bucket upper valve (10) is connected with the upper slag bucket slag drop pipe (18) and a lower slag bucket slag drop pipe (13); the lower slag bucket slag drop pipe (13) is positioned in the middle of the top of the lower slag bucket; two sides of the lower slag bucket slag drop pipe (13) at the top of the lower slag bucket are provided with a pressure measuring port (11) and a depressurizing port (12); the upper part of the lower slag bucket is provided with a lower slag bucket pressurizing water inlet (14) and a circulating water outlet (19); the middle of the lower slag bucket is provided with a lower slag bucket temperature measuring port (15); and the bottom of the lower slag bucket is provided with a lower slag bucket lower valve (16). The invention has the advantages of simple structure, low maintenance amount, long operation cycle and friendly operating environment.