A powder automatic packaging mechanism that folds and packs powdered paper and then packs it with plastic. Due to the unstable factors when the plastic packaging is carried horizontally by the horizontal packaging, the quality of the packaging bag varies. The purpose of the utility model is to provide a vertical plastic packaging mechanism that changes the inner bag from horizontal to vertical. The technical proposal of the utility model is: the plastic packaging tape 22 is vertically arranged up and down, and the inner bag displacement mechanism is a slotted ratchet dial mechanism, which is close to the plastic packaging tape. The feeding inner bag mechanism is an eccentric link moving sub-mechanism, and the pushing plate 7 is close to the cutting point 6 of the plastic packaging tape 22 and the ratchet dial 5 . The heat sealing mechanism is a cam push rod spring returning moving sub mechanism, and is located below the sending inner bag mechanism. The belt transport mechanism is a pair of roller mechanisms that rotate relative to each other and clamps the plastic packaging tape 22 under the heat sealing mechanism. The inner bag is fed into the turntable 5 from the 4 o'clock direction and position and is shifted to 6 o'clock. The push plate 7 feeds 22, and the rollers 20, 21 drive the packing belt 22 to move downwards, which is smoother than the horizontal travel.