A grill stove contains a grilling body and plural heating devices. Each grilling device includes a first heat tube, a second heat tube, an accommodation seat, and a valve unit. The accommodation seat has a first conduit, a second conduit, a gas supply tube, and a dispersion tube. The valve unit has a driving shaft and a control valve, the driving shaft extends out of the accommodation seat and is in connection with a first end of the control valve, and a second end of the valve unit inserts into the first conduit. The control valve has a channel, a first through orifice, a second through orifice, and a third through orifice. The control valve is rotated to stop the gas supply tube, to communicate with the gas supply tube via the first through orifice or to communicate with the gas supply tube via the second through orifice.