The invention discloses a treadmill with shock absorbing device, comprising a bottom plate and a caterpillar, wherein four corners of the bottom plate are fixedly connected with a base, two sides of the top of the bottom plate are fixedly connected with support blocks, the top of the support block is movably connected with a first roller through a rotating shaft, the top of the bottom plate is provided with a groove, and the two sides of the bottom of the groove inner cavity are fixedly connected with a first cushion pad. The bottom plate, the crawler shoe, a support block, a first roll, groove, first cushion, casing pipe, the first spring, the slide bar and the pulley are arranged and used together to solve the problem that the vibration of the existing treadmill is large when running indoors due to the lack of the shock absorbing function, and the damage of the treadmill parts and the service life of the treadmill are affected for a long time. The treadmill with the shock absorbing device has the advantages of good shock absorbing effect, and is worth popularizing and using.