A pipe network leakage monitoring and positioning method comprises the steps that pressure signals or sound wave signals of multiple leakage monitoring instruments are obtained; the position information of abnormal branch joints is determined according to the pressure signals or the sound wave signals; the position information of pipe sections generating the leakage in a pipe network is determined according to the position information of the abnormal branch joints; and the difference of the time when the leakage signals reach the joints at the two ends of each pipe section generating the leakage in the pipe network is determined according to the position information of the corresponding pipe section generating the leakage in the pipe network, and the positions generating the leakage in the pipe network are positioned. By the adoption of the method, the pressure signals or the sound wave signals can be collected in real time, the position information of the abnormal branch joints is determined according to the pressure signals or the sound wave signals, the direction of propagation of the abnormal signals is distinguished according to the sequence relation of the abnormal signals reaching all sensors on the branch joints, and accordingly, the leakage pipe sections and leakage holes are precisely positioned; and positioning of the leakage position in the pipe network is achieved.