The embodiment of the invention provides a temperature control method and a heating cooking device, and belongs to the field of temperature control. The method comprises the steps that the current temperature in a cavity of the heating cooking device is received; the turn-on time of a heating module of the heating cooking device in the next time cycle is calculated according to the current temperature and the target temperature that the interior of the cavity of the heating cooking device needs to maintain; and on-off of the heating module in the next time cycle is controlled according to theturn-on time, wherein the heating module heats the interior of the cavity on the condition that the heating module is turned on. Precise temperature control can be achieved through an easy calculationmethod. In addition, improvement of the control mode can be achieved by updating a software algorithm without changing existing hardware facilities of the heating cooking device and increasing extrahardware cost.