Washing machine capable of automatically judging position of drain pipe and washing machine control method

The invention relates to a washing machine capable of automatically judging the position of a drain pipe and a washing machine control method. The washing machine comprises the full-automatic procedures of washing, rinsing and drying, wherein the washing procedure comprises the processes of water supply, washing and drainage. The washing machine is provided with a magnet and a switch element for judging the position of the drain pipe; and the circuit of the switch element is connected with a computer programmable logic controller. When the washing is finished and the drainage process is started, the control method comprises the following steps of: judging whether the switch element is switched off or not, and transmitting a switch signal to the computer programmable logic controller; if the switch element is switched off, transmitting an alarming signal to indicate the laying-down of the drain pipe by using the computer programmable logic controller; and if the switch element is cut off, transmitting an electrifying signal to a drainage control element and starting draining the washing machine by using the computer programmable logic controller. In the technology of the invention, washing time can be effectively utilized and the safety reliability of the product is improved.