The invention provides a device for catching a broken wire of a bridge dragline based on a metal magnetic memory technique. The device comprises a dragline to be monitored. The device is characterized by comprising a support, rigid connection tubes, a plurality of three-dimensional magnetic memory probes and an integrated controller, wherein the support is arranged on the dragline; the integrated controller is arranged on the support; the three-dimensional magnetic memory probes are arranged on the dragline and are arranged outside the support, the three-dimensional magnetic memory probes and the support are connected by utilizing the rigid connection tubes, and the three-dimensional magnetic memory probes and the rigid connection tubes are in one-one correspondence; the three-dimensional magnetic memory probes are respectively and electrically connected with the integrated controller through a plurality of leads, and the leads are arranged in the rigid connection tubes. The invention further provides a method for catching the broken wire of the bridge dragline based on the device. The device and method for catching the broken wire of the bridge dragline have the advantages that the bridge broken wires can be monitored; the device can immediately give an alarm when the bridge broken wires are monitored so as to ensure the operation safety of a bridge.