Mixing chamber of internal mixer

The mixing chamber of the internal mixer comprises a first mixing chamber shell and a second mixing chamber shell, a first water cooling cavity is formed in the first mixing chamber shell, a second water cooling cavity is formed in the second mixing chamber shell, and the first water cooling cavity and the second water cooling cavity are communicated through an inserting hole and an inserting pipe. A first reinforcing piece is arranged in the first mixing chamber shell and the second mixing chamber shell, a second reinforcing piece is arranged on the outer wall of the first mixing chamber shell and the outer wall of the second mixing chamber shell, and third reinforcing pieces are arranged in the first water cooling cavity and the second water cooling cavity. Water circulation cooling of the two water cooling cavities can be achieved only through one set of circulating water pipes, laying of pipelines is reduced, energy saving is facilitated, the mixing chamber shell is high in structural strength and high in