The present disclosure relates to a discharging apparatus and a 3D printing device thereof, which pertains to the field of the 3D printing device. The discharging apparatus includes a housing, a driving module, and a heating module. The housing includes a body portion, and a movable portion detachably or rotatably connected to the body portion, wherein one end of the body portion is provided with a discharging hole, and in an operating state, the body portion and the movable portion form a relatively enclosed accommodating space. One end of the driving module is connected to the body portion, and the other end of the driving module is movable by a predetermined distance in the accommodating space. The heating module is attached to an inner wall of the body portion and/or the movable portion. In the present disclosure, the heating module is configured to adjust a heating temperature for heating according to a property of a printing material/or a discharging parameter, such that the heating temperature of the heating module is adjusted according to a food material with different molten properties, and 3D printing is practiced using different printing materials. In this way, the problem that an existing chocolate 3D printer can only use chocolate with single purity for the 3D printing and adaptability is poor is solved.