The optical microcavity based optical frequency comb (OFC) has the advantages of low threshold, compact structure, and easy chip integration, and has very good application prospects in the research fields of precision spectroscopy and atomic clocks. Although the research on OFC has achieved rich results, most OFCs have a sparse comb-tooth pattern, which is not conducive to the tuning of OFC. In view of this, the ohmic heat of the high quality factor optical microbubble resonant cavity is used to realize the tuning of the OFC. First, we theoretically analyze the principle of microcavity dispersion, and calculate the relationship between the microcavity dispersion parameter and the size of the microbubble cavity. Then, a microbubble resonator with a diameter of 275 μm and a quality factor of 1.2×10 ⁸ is prepared, a broadband OFC is obtained by continuous laser pumping in the anomalous dispersion region. Finally, the Au microwire is integrated into the empty channel in the microbubble resonant cavity with a diameter of 297.5 μm and placed in the circuit. The current controller is used to apply current to the Au microwire to generate ohmic heat to realize the tuning of the OFC. The range reaches 0.21 nm.