The invention relates to a washing ball and a preparation method thereof. The washing ball is prepared from the following raw materials by mass percent: 70% to 80% of active material, 3% to 5% of alkali, 2% to 8% of antistatic agent, 1% to 3% of dispersing agent, 2% to 6% of disintegrating agent and the balance of water, wherein the disintegrating agent is composed of 90% of sodium bicarbonate and 10% of citric acid. The washing ball has the beneficial effects that the traditional washing concept is changed; and good environmental friendliness, the labor conservation, the water conservation and the time conservation are achieved.