The utility model discloses a networked marine water quality monitor system. The networked marine water quality monitor system comprises an environment monitor and control center and at least one in-situ water quality monitor device, wherein the in-situ water quality monitor device comprises a sensor unit for detecting water quality parameters, a controller and a wireless communication module; and the controller is used for receiving a detection signal sampled and outputted by the sensor unit, and constructing wireless communication link with the environment monitor control center through the wireless communication module to upload monitor data. Through a networking technology, the networked marine water quality monitor system provided by the utility model not only can realize real-time acquisition of different marine parameters of different sea areas, but also can upload the detected water quality parameters to the remote environment monitor and control center through the wireless network in time and further provide the water quality parameters to offshore monitor personnel to realize real-time water quality monitor in different sea areas, thereby improving the mobility in marine monitoring, and enhancing the ecological system prediction and warning capabilities of offshore areas.