The invention relates to a device for measuring the tension of a scraper conveyer chain, mainly comprising a high-pressure pump, a hand compression rod, an unloading valve, a stop valve, a tension meter, a blocking chain block, a telescopic oil cylinder and an oil cylinder piston rod. With the combination of the hydraulic drive, the tension meter and the blocking chain block of the device for measuring the tension of the scraper conveyer chain, the tension of the scraper conveyer chain under the coal mine is measured immediately on the spot, the measured pretension and the static tension are contrasted, compared and are optimized to finally determine the reasonable pretension and the reasonable static tension, the tensioning degree of the scraper conveyer chain is guided and debugged with the pretension and the advantage and the disadvantages of tensioning state of the scraper conveyer chain are appraised with the static tension so that the scraper conveyer chain can be in the reasonable tensioning state to suffer from less accident and have long service life. The device has reasonable and advanced design, compact structure, convenient carrying, mounting and detecting and is safe, stable and reliable, thereby being very ideal.