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This application relates to the field of household appliance technology, and provides a cooking device and control method. The cooking device includes a housing, a steam generator assembly, a valve assembly, and a controller. The housing forms multiple cooking chambers for placing objects to be cooked. The steam generator assembly is disposed in the housing and generates steam to heat the objects. The valve assembly includes steam conduits and steam valves. The steam valves are disposed in the steam conduits and are used to open or close the steam conduits. There are multiple valve assemblies, and each steam conduit connects to a steam generator assembly and a cooking chamber. The controller is communicatively connected to the multiple steam valves to control their opening and closing. The cooking device and control method provided by this application have high steam utilization and good heating uniformity.