Abstract: We hereby make an introduction to a new automatic remote monitoring system specially designed for coastal groundwater based on CDMA wireless transmission technology, sensor technology and computer technology. Monitoring sensors are used for collect the original data of temperature, pressure, salinity and others. A self-developed monitoring host is used to monitor the site location, video and sensor power. And a network of online service software is used for remote transmission of images, sharing data among users, and remote controls of sensors and abnormal alarms. The system is advantaged by high transmission efficiency, stability and reliability, low cost and flexibility for extension. A trial case of the system has been established in the area of Shandong peninsula, which exactly meets the requirement of automatic and digital monitoring of groundwater to effectively improve the quality and efficiency of groundwater monitoring. The system can also provide better services for coastal groundwater resource management. In this paper, the system network, wireless transmission mode, monitoring device and remote monitoring platform are introduced and discussed.