the present invention is a preparation method of an anti - bacterial coating on a plastic surface . a preparation method of an anti - bacterial coating on a plastic surface with a better anti - bacterial effect is provided and comprises putting a plastic substrate into a pvd vacuum device ; coating an anti - bacterial metallic layer on the plastic surface ; and spray coating an anti - bacterial middle coating on the sample coated with anti - bacterial metallic coating . utilizing pvd to coat antibacterial layer offsets timeliness of bacterial activity of the organic anti - bacterial coating , which allows the products with double bacterial layers have excellent anti - bacterial and bacteria - inhibited effects during their life spans . the anti - bacterial effect can not only be lasted for a long time , but also achieve high anti - bacterial efficiency . the product has excellent function and superior appearance , which is suitable for bath products , electronic devices , domestic appliances , cars and other industries .