The invention discloses a mechanical characteristic state on-line monitoring system for a high voltage breaker. The mechanical characteristic state on-line monitoring system includes a plurality of data acquisition units, monitoring execution units and remote servers on a high voltage breaker end, wherein a data disability unit includes a current sensor, a voltage sensor, a displacement sensor, and a circuit control panel with high speed and high precision analog quantity and with a digital quantity inputting and outputting function; the current sensor, the voltage sensor and the displacement sensor are connected with the circuit control panel; each monitoring execution unit includes a data storage module, a display terminal, an FPGA processor and a communication module; the circuit control panel is connected with the FPGA processor; the FPGA processor is connected with the data storage module, the display terminal and the communication module at the same time; and the plurality of monitoring execution units are connected with the remote servers through the communication modules. The mechanical characteristic state on-line monitoring system for a high voltage breaker has the advantages of being high in timeliness, accuracy, anti-interference capability and reliability, and being low in cost.