A thermal immersion circulator includes a main body having a receiving cavity, a partitioning member received in the main body to divide the main body into an upper portion and a lower portion, a heating element provided in the lower portion of the main body, a circulator pump provided in the lower portion of the main body, and a handle assembly. When the lower portion of the main body is immersed in the cooking cavity, the circulator pump is adapted for sucking water into the lower portion of the main body through a water inlet for being heated by the heating element. The heated water is then guided to be discharged out of the main body through a water outlet.