The invention discloses a quantization evaluating device and method for dyskinesia symptoms of Parkinson and related extrapyramidal diseases. The device comprises an S-shaped gait channel, a finger inertia element node, a body inertia element node, a high-speed image collection unit, a central computer, an inertia element synchronization box, a synchronization state lamp, a wireless router, a switch and a power supply. The method comprises the steps of starting initialization of devices and starting the devices, adding basic information of testing personnel or searching existing testing personnel, selecting a collection mode, synchronizing a data collection unit module, collecting, displaying and storing data under assigned actions in real time, analyzing the data, and storing and printing quantization evaluating results. According to the quantization evaluating device and method for the dyskinesia symptoms of the Parkinson and related extrapyramidal diseases, the subjective evaluating method depending on the experiment of clinicians is thoroughly changed, and the device and method have improved theoretical value and realistic guidance significance on treatment of patients with dyskinesia, making of rehabilitation schemes and judgment of the curative effect and a prognosis.