The Digital Water Curtain system is made up of any word and pattern through the free fall of water, installing a matching high-speed solenoid valve in each water tap. Every water tap equals to pixel width while time of valve opening equals to the pixel height. When water is pumped to top storage tank, meantime the computer program in the actuator drives the solenoid valve and LED light. The commend date for opening and closing time on corresponding solenoid valve calculated by the computer program makes each water outlet length of water taps reaching the needs of computer operation. Thus, different water length and width become some image、word、company logo、slogan before falling into the water surface, at the same time, the LED lights above offer various color and brightness according to the computer command making image、word、company logo、slogan colorful.