A coffee bean conveyance device includes a conveying unit, a coffee bean holding unit and a driving mechanism. The conveying unit is a hollow member detachably assembled to the coffee bean holding unit, such that the coffee bean holding unit and the conveying unit are internally communicable with each other. The driving mechanism is eccentrically connected to the conveying unit, such that axes of the conveying unit and driving mechanism are parallelly spaced from each other. When the driving mechanism operates, coffee beans in the coffee bean holding unit are caused to stably move into the conveying unit and a constant weight or quantity of coffee beans is continuously fed to a coffee bean grinder or a coffee bean dispenser disposed below an outlet of the conveying unit. With these arrangements, the feeding of irregular weight or quantity of coffee beans to the coffee bean grinder or dispenser is avoided.