Abstract: The present invention relates to a knockdown type combination locking device which comprises: a housing body in the form of a rectangular structure with a hollow space for containing a dialing wheels set, a tongue at top of an end side, and two longitudinal sides each with a inclined protrusion at an end; a front plate made of plastic material by injection process, having a plurality of dialing wheel openings, a latch opening and a shifter opening on the front side and two parallel connecting plate at the bottom each with a latch openings and such connecting plate is higher at the latch opening side; a sliding member in the form of a board having a plurality of dialing wheel openings and two hooks at one end, two rectangular openings at the other end; a coupling element in the form of a U-sheet having two openings and two forked portions at a lateral side; and an operating mechanism made of plastic material by injection process having a pair of parallel pawls extending perpendicularly and each pawl has a hook