A punch-down device includes a housing, a driving mechanism, and at least one punch-down member. The housing forms therein hollow channels. The driving mechanism includes a rotation shaft and at least one rotary wheel, which is connected and supported by the rotation shaft at a top portion of the housing. The rotation shaft has an end extending outside the housing to form a coupling section. Each of the rotary wheels has a surface forming two tracks and two pegs. The two pegs of one rotary wheel are received in the two tracks of an adjacent one of the rotary wheels. The punch-down member is received in the hollow channels to correspond to the rotary wheels and be driven to move by the rotary wheels. The punch-down member has lower ends forming conductor depression sections. As such, the punch-down device carries out an operation of punching down and depressing conductors, whereby the efficiency of punch-down operation is increased and the operation is easy and reliable positioning is achieved.