The invention relates to a water level detecting device and method for a dryer, which solve the problems that when the condensed water near to the distilled water is collected, it is impossible to detect the electrode sensor in a way of driving irrelevant to the quantity of the dehumidification water; the costuming is damaged in a way of driving based on a humidity detected by an electrode sensorand irrelevant to the costuming of the drying articles; and there is an error in judging the water level owing to not considering the characteristic of the detection unit. Therefore, the invention accurately detects the water level.