The invention relates to a device system for online monitoring pressure and flow of supplied water in real time, which comprises a monitoring control center by wireless signal transmission and monitoring control stations dispersed and arranged for each water customer; and the monitoring control station comprises a remote signal transmission water meter (2), an intelligent data collector (3), a water guide electromagnetic valve (11), a remote control water power valve (12), a microwave data transmission radio station (6) or a GPRS/CDMA (21), a pressure sensor (4), a single input digital displaying instrument (5), a power supply I, a programmable controller (8), a sound and light alarming device (10), a common sluice valve (17), a bypass valve (18) and the like. The monitoring control center comprises a power supply II, the microwave data transmission radio station (6) or an Internet (22), an industrial controller operating software (9), the programmable controller (8), the sound and light alarming device (10) and the like. The device system can realize the functions of monitoring the pressure and flow of the supplied water of the water customer on line in real time, pre-charging water fee of the customers, automatically descending the water fee along the accumulated water consumption amount of the customer, reminding the customer of paying the water fee in advance, automatically cutting off the water supply by remote control when defaulting, automatically supplying water by remote control after payment and the like.