The invention discloses a constant temperature water bath pot with a multi-aperture fixed bracket. The constant temperature water bath pot comprises: a pot body, a porous shelf, a heating pipe and fixed projection blocks, wherein the fixed projection blocks are symmetrically and vertically distributed on the inner wall of the constant temperature water bath pot at different heights, and the porous shelf is arranged inside the pot body through the fixed projection blocks on the inner wall of the constant temperature water bath pot, is positioned above the heating pipe, and is provided with object placing holes having different pore sizes. In the prior art, the test tube, the flask and other containers are difficult to be stably placed in the constant temperature water bath pot during the experiment. According to the present invention, the problem in the prior art is solved, and the problems that the sample outflows and the heating area is not uniform due to the easy inclination of the containers having different shapes during the heating process are effectively avoided through the trapezoidal object placing holes on the porous shelf, such that the accuracy of the subsequent experiment result is improved, the whole structure is simple, and the operation is convenient.