Lifting adjusting device and conveying system

The invention relates to a lifting adjusting device. The lifting adjusting device comprises a mounting base frame and a lifting device, the tray mechanism is matched with the installation base frame in a guiding mode, a buffering assembly is arranged on the balance weight mechanism, and the balance weight mechanism is matched with the installation base frame in a guiding mode through the buffering assembly. And the lifting mechanism is arranged on the mounting base frame, and the lifting mechanism is used for driving the tray mechanism and the counterweight mechanism to carry out lifting adjustment. The buffer assembly is movably and additionally arranged on the balance weight mechanism, so that the balance weight mechanism can perform buffer movement (or floating) relative to the mounting base frame through the buffer assembly when the balance weight mechanism is in guide fit with the mounting base frame, and the phenomenon that the balance weight mechanism and the mounting base frame are clamped or stopped