Control method of a water-saving washing machine and washing machine

A control method of a water-saving washing machine of which a locking hole and a drainage port are formed in the bottom of an inner tub, and a locking mechanism and a drainage control mechanism are arranged at the bottom of an outer tub, comprising:

• Step I:
• carrying out a washing/rinsing procedure,
• a master control board controlling the locking mechanism to couple with the locking hole to lock the inner tub, and the drainage control mechanism blocking off the drainage port,
• supplying water to the inner tub of the washing machine until a set water level or water volume is reached,
• starting washing, wherein water is absent between the inner tub and the outer tub;
• Step II:
• carrying out a drainage procedure after the washing/rinsing procedure ends up,
• the master control board controlling the drainage control mechanism to open the drainage port, and water in the inner tub being drained through the drainage port;
• Step III:
• carrying out a dewatering procedure after the drainage procedure ends up,
• the master control board controlling the locking mechanism to release the inner tub, and to drive the inner tub to rotate for dehydration.