The invention provides an electric steam oven, which comprises a shell, an inner container, a water pan, a water valve, a door body and a control device, wherein the shell is provided with an installation cavity; the inner container is provided with a containing cavity; a drain hole is formed in a bottom plate of the inner container; the water pan is located on the lower end of the inner container; the water valve is respectively communicated with the drain hole and the water pan; the control device is connected with the water valve, and controls the water valve to open or close according to the working condition of the electric steam oven. According to the electric steam oven provided by the invention, when the electric steam oven is at a working condition, the water valve is closed, and the containing cavity of the inner container of the electric steam oven is at a closed state, so that steam cannot leak from the drain hole, and the cooking effect of the electric steam oven is ensured; after cooking is finished, the control device controls the water valve to open, and collected water in the containing cavity can flow into the water pan through the water valve from the drain hole so as to be drained, so that the using comfort degree of the product is improved.