Lock catch structure for fast assembly of packaging box

The utility model discloses a fast-assembly lock catch structure of a packaging box, which comprises an upper metal piece fixed on a box cover and a lower metal piece fixed on a box body, and is characterized in that an upper catching groove is formed on the upper metal piece, a lower catching groove is formed on the lower metal piece, and when the box cover covers the box body, the upper catching groove and the lower catching groove are vertically opposite to each other; lock catch plates are used for locking the upper catching grooves and the lower catching grooves, so that the box cover and the box body are fixed; the lock catch plate is a strip-shaped plate, the middle of the lock catch plate is an arc-shaped body protruding outwards, the top of the arc-shaped body is bent inwards and downwards to form a straight hook body, the bottom of the arc-shaped body is bent inwards and then bent reversely to form an arc-shaped hook body, and the tail end of the arc-shaped hook body extends outwards in an inclined