The invention discloses a submarine pipeline double-channel fixed-point damage monitoring system based on weak magnetism. According to the system, a detection signal output port of a sensor is connected with a detection signal input port of an A/D converter, and a detection signal output port of the A/D converter is connected with a detection signal input port of a single-chip microcomputer. A reset signal input port of the single-chip microcomputer is connected with a reset signal output port of a reset portion, and an interruption signal input port of the single-chip microcomputer is connected with an interruption signal output port of an external interruption portion. An alarm signal output port of the single-chip microcomputer is connected with an alarm signal input port of an alarm portion, and a storage signal output port of the single-chip microcomputer is connected with a storage signal input port of an external parameter storage device. The novel weak-magnetism submarine pipeline double-channel fixed-point damage monitoring system is suitable for the submarine operation. By use of the metal weak magnetism principle, early-stage fixed-point flaw detection monitoring of theimportant portion of a submarine pipeline can be achieved.