The torrential rains brought by typhoons in Taiwan during the summer often cause huge losses to aquaculture, while cold snap in winter cause the sudden death of the milkfish. Simultaneously, the lack of manpower is also one of the potential problems. Based on the above factors, this paper uses wireless transmission technology with various sensors to transmit the data to the server. It can increase the productive capacity and effectively reduce the mortality rate and manpower costs. Since the pH sensor cannot be placed in the water for a long time to measure, it takes manpower and time to take the instrument to the fish farm for detection. Therefore, a robotic arm was developed to complete a series of automatic measurement and maintenance actions. In this way, this design can improve the problem of contamination of the pH sensor and avoid the measurement error. This intelligent system can work twenty-four hours a day and effectively reduce the loss of personnel, material, and data errors.