The utility model discloses a but clamping device of clamping belt electricity body, including basic pole, articulate two clamping jaws of the left and right sides at basic pole front end, the clamping jaw includes the flexible core bar in the clamp sleeve, clamp sleeve, clamp sleeve's the outside is equipped with the spout, is equipped with the sliding pin on the flexible core bar, be equipped with on the basic pole with the linkage unit that the actuating sleeve is related, be equipped with the actuating lever between sliding pin and linkage unit, when the linkage unit is located standby position about, two clamping jaws at opening the state, when linkage unit antedisplacement during to hookup location, the actuating lever makes flexible core bar stretch out clamp sleeve and interconnectabout, and two clamping jaws then are close to each other forms the annular connection status of circle, when actuating sleeve during together with the linkage unit rearward movement, the actuating lever makes flexible core bar withdrawal clamp sleeve, and clamp sleeve's front end is close to each other makes the clamping jaw be in clamping state. The utility model discloses both can improve clamping device's intensity effectively, can avoid the slippage of charged body again, be favorable to increase of service life simultaneously.