The invention provides an escalator hand strap slip testing device which comprises a mounting platform, a force applying mechanism, a pressing mechanism and a speed measuring mechanism; the mounting platform comprises a tabletop panel, and supporting legs, a first supporting frame and a second supporting frame are arranged on the tabletop panel; the pressing mechanism comprises a counterweight assembly, a fixing assembly and two roller fixing plates, a first supporting shaft, a second supporting shaft and a plurality of roller shafts are arranged on the two roller fixing plates;, rollers are arranged on the roller shafts respectively, the first supporting shaft is mounted on the first supporting frame, the second supporting shaft is mounted on the second supporting frame; the force applying mechanism comprises a blocking assembly and a main shaft, a ratchet wheel in friction transmission with the main shaft is arranged on the main shaft, and the main shaft is in transmission connectionwith the roller shafts, and the blocking assembly comprises a pawl and a ratchet that can leave from or be clamped into the ratchet wheel; and the speed measuring mechanism comprises a first speed sensor, a second speed sensor and a third speed sensor. According to the invention, slip test can be carried out on a hand strap by simulating the hand strap with frictional load.