The invention discloses a steam pipe network water attach risk monitoring and early warning system and method. The system comprises a water draining pipe serving as a steam pipe network branch pipe, apower supply and signal transmission module arranged in a control cabinet, a pressure sensor used for detecting the pressure in a pipe of the steam pipe network, a temperature sensor used for detecting the water temperature in the water draining pipe and an upper computer achieving judging and early warning functions. The water draining pipe outputs cooling water after passing through a water draining device. The power supply and signal transmission module is connected with the power end of the pressure sensor and the power end of the temperature sensor. The signal end of the pressure sensorand the signal end of the temperature sensor are connected with the power supply and signal transmission module, and the power supply and signal transmission module transmits signals of the pressure sensor and the temperature sensor to the upper computer. The steam pipe network water attach risk monitoring and early warning system and method have the beneficial effects that the method used for thesystem and the system upper computer is used for conducting scientific and effective early warning analysis on the pipe network water attack risk and conducting real-time early warning, and safety running of the steam pipe network is ensured.