A washing machine without water between barrels and control method are provided. The washing machine comprises an outer barrel (4), an inner barrel (1), an air chamber (7), and a pressure sensor (19) connected to the air chamber (7). A plurality of drainage holes (2) are arranged on the upper part near the edge of the inner barrel (1). At least one inner barrel drain outlet (3) is arranged at a bottom of the inner barrel (1). A telescopic drain valve capable of plugging the inner barrel drain outlet (3) is arranged at a bottom of the outer barrel (4). An outer barrel drain outlet (5) is arranged at the bottom of the outer barrel (4). A washing machine drainage pipeline (6) is arranged on the outer barrel drain outlet (5). The outer barrel (4) is provided with the air chamber (7) communicated with the inner barrel (1). An air chamber drain outlet (8) capable of discharging water in the air chamber (7) is arranged on the air chamber (7). The washing machine drains water thoroughly, there is no residue, and the
