The invention provides a rotary heating device and an automatic cooking method of the rotary heating device. The rotary heating device comprises a container, a heating unit, a supporting mechanism and a machine frame, wherein the container is provided with at least one opening, the heating unit is used for heating the container, the supporting mechanism is used for limiting the container to rotate around a first rotary shaft relative to the supporting mechanism, and the machine frame is used for limiting a combination formed by the container and the supporting mechanism to move according to a predetermined trajectory relative to the machine frame. The rotary heating device is applicable for solid materials, liquid materials, adhesive materials and mixtures of the solid materials, the liquid materials and the adhesive materials. The effect that the materials are heated thoroughly and uniformly is guaranteed, and multiple functions such as scrapping, rolling, breaking up, cutting, overturning, fluid conveying and automatic cleaning can further be accomplished at the same time, cooking functions of automatic cooking are enriched, cooking efficiency is also improved, and meanwhile, the rotary heating device has high technical scalability at the same time.