The invention provides a washing machine and an automatic control method thereof. The method comprises the following steps: a, receiving instructions input by a user through a start button; b, allowing the washing machine to be in a weighing mode according to the instructions so as to acquire the weight of clothes in a cylinder, wherein the weighing mode is connected in parallel with a motor; and c, determining the water level and washing mode correspondingly according to the weight obtained, and controlling the washing machine to perform washing. According to the washing machine and he automatic control method thereof provided by the invention, the automatic washing of clothes can be realized only through a button, the automation degree is higher, the purposes of energy conservation and environmental protection are achieved. Besides, the control method is simple, a washing machine operation interface is simple, and the time is saved.