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The current real-time strain measurement device of high-altitude airship capsule cannot have the working attributes of small size and real-time measurement at the same time. We have proposed a measuring device that can monitor the strain of the airship capsule on-line, which can realize on-line strain measurement with high measurement accuracy by measuring the relative displacement of the two fixed points of the airship capsule during work,. This method innovatively uses optics and photosensitive elements to convert strain into displacement for measurement. The TCD1500C charge coupling device is used as the data source. The main chip uses ZYNQ processor, which can have the parallel processing capability of FPGA and the data scheduling capability of Cortex, as well as processing CCD high-speed data. By customizing an IP core and using the AXI interconnection protocol between the PS terminal and the PL terminal, it is capable of high-speed and large-scale data transmission. In order to obtain the strain signal, a method of transforming the strain signal into the displacement signal is adopted, and then the displacement signal is collected and stored in the SD card and periodically displayed on the host computer to realize the real-time monitoring of the airship capsule strain on the ground. In consequence，the real-time measurement of the strain of the airship capsule is enabled and the measurement accuracy is improved to 0.1%.