Disclosed are a reduction clutch capable of positioning an inner tub and a washing machine. An input shaft (1) of the reduction clutch (500) is connected to an output shaft (4) via a gear train (3). An input shaft sleeve (2) is connected to an output shaft sleeve (5). A clutch shaft sleeve (6) slides axially to a lower portion to connect to a driving device and slides to an upper portion to connect to a fixed disk (8). The clutch shaft sleeve (6) sliding to the upper portion only has one position capable of connecting to the fixed disk (8) in the circumferential direction. The positioning of the input shaft sleeve (2), the output shaft sleeve (5) and an inner tub (100) in the circumferential direction is achieved by the connecting position. A first water drainage hole (105) is arranged at the bottom of the inner tub (100). A circle of second water drainage holes (106) are arranged at the upper portion of the inner tub (100). Apart from the first water drainage hole (105) and the second water drainage holes (1
