The invention discloses an electronic device and a battery compartment thereof, which are used for overcoming the defect of relatively high difficulty during assembly and welding operation of the battery compartment of the electronic device in the prior art. The battery compartment comprises a first compartment segment and a second compartment segment which can be detachably combined, wherein a semi-sealed accommodating space for accommodating a dry battery is formed after the first compartment segment and the second compartment segment are combined, the first compartment segment comprises a first combination end and a first matching end, the first combination end is combined with the second compartment segment, the first matching end is matched with a first electrode of the dry battery, the second compartment segment comprises a second combination end and a second matching end, the second combination end is combined with the first compartment segment, and the second matching end is matched with a second electrode of the dry battery. In the battery compartment, the electrode can be welded with a printed circuit board (PCB) before the electrode is arranged in the battery compartment, thus, the length of the electrode extending out of the battery compartment can be small, and the miniature design of an electronic product is promoted.