With the aims to overcome the disadvantages of existing homemade detection device for broken wires of wire ropes,such as low detecting precision and poor stability of test result,a new instrument for detecting and processing signal of leakage magnetic field for broken wire of mine-hoisting wire ropes has been studied and developed.The new instrument can achieve the real-time,on-line,quantitative and multi-channel damage detection of mine-hoisting wire ropes based on the principle of high intensity magnetic field detection,and can offer network service,so it is better scientific,exact and reasonable than the existing detection device in determining damage of wire ropes.