A latch device comprises a housing unit (3), a disk unit (4), an electromagnetic lock unit (5), a pressing lock unit (6), and a detecting unit (7). The housing unit includes a housing (31), which has a pressing hole (32) and an insertion slot (33). The disk unit includes a supporting rod (41) positioned through the housing, and two vertical disks (42) pivotally arranged to the supporting rod. The outer perimeter of the two disks is placed with a hook (421), a first engaging portion (422) and a second engaging portion (423). The electromagnetic lock unit includes two electromagnetic mechanisms (51), two retractable bars (52) connected to the two electromagnetic mechanisms, and two electromagnetic latches (53) respectively connected to the two retractable bars. The pressing lock unit includes a pushbutton (61), and a button latch (62) connected to the pushbutton. The detecting unit includes two detectors (71), which are disposed inside the housing for detecting the position of the two electromagnetic latches.