Surface myoelectricity acquisition device and myoelectricity signal processing method thereof

The invention discloses a surface myoelectricity acquisition device and a myoelectricity signal processing method thereof. The surface myoelectricity acquisition device comprises a first electrode, a second electrode, a third electrode, a front end amplification module, a leg driving module, a band-pass filtering module, a working frequency filtering module, an electrical level lifting module, an AD (Analogue-Digital) acquisition module, a microprocessor and a digital separation module, wherein the first electrode and the second electrode are connected with the band-pass filtering module by the front end amplification module; the third electrode is connected with the front end amplification module by the leg driving module; the band-pass filtering module, the working frequency filtering module, the electrical level lifting module, the AD acquisition module, the digital separation module and the microprocessor are connected in sequence; the leg driving module is used for extracting a human body reference electric signal so that the effects of rapidly discharging, and effectively damping a human body common-mode voltage signal are realized; the common-mode inhibition rate and the input impedance are improved through the front end amplification module so that the precision of acquired myoelectricity signal data is high.