A heating ventilator for bathroom includes a frame, a motor mounted with fan blades, a volute casing, an air path switching plate located at the air outlet of the volute casing for switching the air outlet of a ventilator main body, a heater, and a control electric circuit mechanism for operating the motor, the air path switching plate and the heater. The air path switching plate and the heater are configured in a separate and overlapping manner in the height direction of the ventilator main body. The center line of the fan blades and a tongue of the volute casing are both offset from the center line of the main body and are located at the same side. The center line of the main body is horizontally aligned and overlapped with the center line of the air path switching plate and the center line of the heater.