The invention discloses a clamping mechanism which comprises a clamping arc stripe, wherein the clamping arc stripe is connected with the top of a first support stripe by a connecting block, the middle of the first support stripe is hinged with a hinged plate by a first hinge pin, the bottom of the first support stripe is hinged with one end of a second support stripe by a second hinge pin, the other end of the second support stripe is hinged with a driving ring by a third hinge pin, and the driving ring is assembled with a second driving shaft by threaded spinning; the bottom of the second driving shaft is connected with the output shaft of a second motor; a first driving shaft is connected with a limiting plate after passing through a fixed plate, and the limiting plate is assembled in alimiting slot at the bottom of a heating plate; the heating plate is fixed on the fixed plate, and the fixed plate is connected and fixed with the inner wall of a fixed barrel; the second driving shaft is a screw; the hinged plate is fixed on the heating plate; and an avoidance slot is formed at the corresponding part of the fixed plate and the first support stripe. The invention also discloses amilk bottle applying the clamping mechanism. According to the invention, the functions of stirring, heating and weighting are integrated, and the whole structure is more reasonable and simpler.