The present invention discloses a muscle spasticity evaluation device and evaluation method thereof. The muscle spasticity evaluation device is used to evaluate muscle spasticity of a tester’s limb, and includes a sensing-calculating module, a spasticity analysis module and a spasticity evaluation module. The sensing-calculating module includes a motion sensing unit and a motion calculating unit. The motion sensing unit senses the limb’s movement of the tester and generates a sensing signal. The motion calculating unit generates a limb movement signal according to the sensing signal. A jitter calculating unit of the spasticity analysis module executes the limb’s jitter analysis according to the limb movement signal, so as to generate a plurality of jitter parameters. A spasticity quantify analysis unit of the spasticity evaluation module executes spasticity analysis according to the jitter parameters, so as to generate a spasticity analysis result.本發明揭露一種肌肉痙攣評估裝置及其評估方法。肌肉痙攣評估裝置用以評估一受測者之患肢的肌肉痙攣程度,並包括一感測運算模組、一痙攣分析模組以及一痙攣程度評估模組。感測運算模組包含一動作感測單元及一動作運算單元,動作感測單元感測受測者之患肢移動而產生一感測訊號,動作運算單元依據感測訊號產生一患肢移動訊號。痙攣分析模組之一抖動運算單元依據患肢移動訊號進行患肢的抖動分析,以產生複數抖動參數。痙攣程度評估模組之一痙攣程度量化分析單元依據該些抖動參數進行痙攣程度分析,以產生一痙攣程度分析結果。1‧‧‧肌肉痙攣評估裝置11‧‧‧感測運算模組111‧‧‧動作感測單元112‧‧‧動作運算單元1121‧‧‧移動角度運算元件1122‧‧‧移動軌跡運算元件12‧‧‧痙攣分析模組121‧‧‧抖動運算單元13‧‧‧痙攣程度評估模組131‧‧‧痙攣程度量化分析單元S1‧‧‧感測訊號S2‧‧‧患肢移動訊號S3‧‧‧抖動參數