The invention relates to an auxiliary mobile buckle for a beaker. The auxiliary mobile buckle comprises a strip-shaped supporting arm, the supporting arm comprises a back face side and a front face side, and a first elastic arm is arranged at the top of the supporting arm; a three-edge fixing frame is arranged at the back face side of the upper end of the supporting arm and comprises a bottom frame edge, a side frame edge and a top frame edge, a mobile through hole for the fingers to run through is defined by the bottom frame edge, the side frame edge, the top frame edge and the first elasticarm, and the free end of the top frame edge extends to the front face side of the supporting arm; a second elastic arm is downwards arranged at the free end of the top frame edge, a press strip is arranged at the end, away from the top frame edge, of the second elastic arm, and a limit blocking strip is fixedly arranged on the lower surface of the top frame edge and located at the back face side of the first elastic arm. The auxiliary mobile buckle can clamp the beaker, the beaker can freely move after being heated, the hand scald caused by the beaker is avoided, and meanwhile the auxiliary mobile buckle is simple in overall structure, low in cost and convenient to use.