The invention discloses a test device used for engine valve timing continuous adjustment. The test device comprises a phase adjustment component fixedly connected with a cam shaft and a rotary drive component detachably connected with the phase adjustment component. When the test device is used, engine valve timing can be conveniently adjusted, test type selection and scheme verification of different valve timings can be carried out, a test cycle can be shortened, and the test device has the advantages of being easy and convenient to operate, high in precision and low in cost.