The present invention provides a drainage mechanism of a washing machine, applicable to a washing machine which performs washing and rinsing procedures without water between an inner tub and an outer tub. The washing machine comprises an inner tub (1) without holes in the lower part of a tub side wall. The drainage mechanism of the inner tub (1) comprises a water sealing cover (8), a lever structure and a driving device, a resistance arm end of the lever structure is connected with the water sealing cover (8), the driving device for driving the lever structure to work is arranged at an driving arm end of the lever structure, a drainage outlet is formed in a bottom wall of the inner tub (1), and the lever structure is driven by the driving device and drives the water sealing cover (8) to close the drainage outlet in the washing and rinsing procedures and to open the drainage outlet in a draining procedure. According to the drainage mechanism provided by the present invention, the resistance arm end of the leve
