The utility model relates to a measuring device for hydraulic rock anchor grouting, which belongs to equipments of an engineering detecting instrument, and comprises an electrode, node electrodes, leads, a wavelength switch and a measuring instrument. The electrode is connected with one wiring terminal of the measuring instrument through the leads; the node electrodes are arrayed in sequence and respectively connected with the wiring terminals of the wavelength switch through the leads; the wavelength switch is connected with the other wiring terminal of the measuring instrument through the leads; and the measuring instrument adopts an AVOmeter or an ohm gauge. The measuring device can select a plurality of measuring points according to the grouting depth requirements limberly, the actual observation and the grouting construction can be carried out synchronously, the multi-station observation can also play the role of early-warning construction, the wavelength switch of the measuring device realizes the multi-station observation, and the AVOmeter and the ohm gauge are easy to popularize because the cost is low, and the purchase, use and carrying are convenient. The measuring device has the advantages of reasonable structure, convenient installation and use, intuitional measuring effect and high efficiency.