The invention discloses safe and environment-friendly tea seed washing powder and a preparation method thereof. The preparation method comprises the following steps: step 1, taking raw materials, namely, weighing the following raw materials in parts by mass: 60-70 parts of camellia seed, 15-30 parts of Chinese honey locust, 5-10 parts of cacumen biotae, 0.5-3 parts of cortex albiziae, 0.5-3 parts of pomegranate bark and 0.5-2.5 parts of natural borneol; step 2, crushing, namely, respectively crushing the weighed raw materials by using a crusher so as to obtain raw material powder; step 3, mixing, namely, mixing the raw material powder, and uniformly stirring the raw material powder; step 4, sterilizing, namely, sterilizing through ultraviolet ray or microwave, and further sealing and packaging so as to obtain the safe and environment-friendly tea seed washing powder. The safe and environment-friendly tea seed washing powder is high in active substance content, good in detergency, good in sterilizing effect, non-toxic, non-irritating, anti-anaphylaxis, low in foam and water-saving, so that the powder can be used as a safe and environment-friendly washing product which is ideal for washing food, utensils, tableware, vegetables and fruits in daily life of people.