A muscle massaging device and an operating method thereof are provided. The muscle massaging device, comprising includes: a detector, configured to detect a real-time myoelectric value and a real-time muscle tension value of a target muscle; a comparator, configured to compare the real-time myoelectric value and a prestored myoelectric value, and compare the real-time muscle tension value and a prestored muscle tension value; and a massager, configured to massage a first region corresponding to the target muscle.