A method for producing a hollow engine valve including a valve body in which a hollow hole extending through a valve umbrella portion and a hollow stem portion connected to the valve umbrella portion is formed, characterized in that the method comprises: shaping a solid round bar which is a raw material of the valve body into a valve body semi-finished product in which a semi-finished product hollow hole is formed, by performing hot forging once, the semi-finished product hollow hole corresponding to the hollow hole and extending through a semi-finished product valve umbrella portion corresponding to the valve umbrella portion and a semi-finished product hollow stem portion corresponding to the hollow stem portion; subjecting the valve body semi-finished product to a rotary swaging process in which an outer peripheral surface of the semi-finished product hollow stem portion is pressed while the valve body semi-finished product is rotated, and thereby reducing a diameter of the semi-finished product hollow stem portion and increasing a stem length of the semi-finished product hollow stem portion; subjecting the valve body semi-finished product subjected to the rotary swaging process to a necking process in which the semi-finished product hollow stem portion and a semi-finished product neck portion being a connection portion between the semi-finished product valve umbrella portion and the semi-finished product hollow stem portion are drawn stepwise, and thereby reducing the diameter of the semi-finished product hollow stem portion and increasing the stem length of the semi-finished product hollow stem portion to shape the valve body semi-finished product into the valve body; and joining a stem end sealing member to an end portion of the hollow stem portion in the valve body to seal the hollow hole. shaping a solid round bar which is a raw material of the valve body into a valve body semi-finished product in which a semi-finished product hollow hole is formed, by performing hot forging once, the semi-finished product hollow hole corresponding to the hollow hole and extending through a semi-finished product valve umbrella portion corresponding to the valve umbrella portion and a semi-finished product hollow stem portion corresponding to the hollow stem portion; subjecting the valve body semi-finished product to a rotary swaging process in which an outer peripheral surface of the semi-finished product hollow stem portion is pressed while the valve body semi-finished product is rotated, and thereby reducing a diameter of the semi-finished product hollow stem portion and increasing a stem length of the semi-finished product hollow stem portion; subjecting the valve body semi-finished product subjected to the rotary swaging process to a necking process in which the semi-finished product hollow stem portion and a semi-finished product neck portion being a connection portion between the semi-finished product valve umbrella portion and the semi-finished product hollow stem portion are drawn stepwise, and thereby reducing the diameter of the semi-finished product hollow stem portion and increasing the stem length of the semi-finished product hollow stem portion to shape the valve body semi-finished product into the valve body; and joining a stem end sealing member to an end portion of the hollow stem portion in the valve body to seal the hollow hole.