A coffee bean roasting-degree distribution measuring device includes a housing, a micro-processing unit, an image-capturing unit, a light-emitting unit, and a displaying unit. The housing has a first end and a second end opposite the first end with an accommodating space existing between the first end and the second end. The second end is disposed to surround a group of coffee beans under measurement. The micro-processing unit and the image-capturing unit are disposed inside the accommodating space and electrically connected to each other. The light-emitting unit is disposed inside the accommodating space and includes at least one light emitter and a circuit board electrically connected to the light emitter. The circuit board is further electrically connected to the micro-processing unit and each of the light emitter has a light emitting port facing toward the second end. The display unit is disposed on the first end and electrically connected to the micro-processing unit to display a measured roasting-degree distribution curve.