The invention discloses an on-line intelligent network automatic water treatment detection and control system which comprises a control center platform, a main board, a sensor, a pollution discharge, water replenishing and dosing device, an alarm module, a display screen, a computer and an intelligent mobile phone, wherein the output port of the sensor is connected with the input end of the main board, the output port of the main board is connected with the input end of the pollution discharge, water replenishing and dosing device, the output end of the main board is respectively connected with the display screen and the alarm module, the output end of the main board is connected with the computer or the intelligent mobile phone through the Internet or GPRS network, the main board and the control center platform are in bilateral interaction, and the control center platform and the intelligent mobile phone are in bilateral interaction. According to the invention, the sensor is used for detecting water quality data, and the opening and closing of the pollution discharge, water replenishing and dosing device are remotely controlled through the Internet, so that the electricity, water and chemical agents are furthest saved, the service life of an air conditioner is prolonged, the running cost of the air conditioner is lowered, and the environmental pollution is reduced.