The invention discloses a transformer mechanical stability fault monitoring and diagnosing system and belongs to the technical field of transformer monitoring. With the system adopted, remote monitoring and fault diagnosis can be performed on the abnormal vibration of a transformer, and the faults of the abnormal vibration of the transformer can be timely found out. A sensor layer comprises a plurality of ICP sensors, a plurality of load current sensors and a neutral point grounding current sensor, wherein the ICP sensors are attached onto or fixedly connected to the outer surface of an oil tank, the load current sensors are arranged at the load end of a transformer, and the neutral point grounding current sensor is arranged on the neutral point flat iron of the transformer; a data converging layer comprises an AD data acquisition module and a high-speed signal analysis module; a network layer comprises an edge calculation module; a management layer comprises a transformer fault monitoring platform; the ICP sensors, the load current sensors and the neutral point grounding current sensor are all connected with the AD data acquisition module; the high-speed signal analysis module isin signal connection with the AD data acquisition module and the edge calculation module; and the edge calculation module is in communication connection with the transformer fault monitoring platform.