The invention relates to a rotary semiautomatic packing machine for packing fine powder materials, which is suitable to be used for semiautomatic packing of power materials in petrochemical, chemical, food, medicine or the like fields. The invention aims to solve the problems that the prior fine powder material packing machine is low in production capacity and has a severe operational environment. The packing machine comprises a charging barrel 1, a frame 2, a rotation driving mechanism 3, a supporting upright post 4, a rotary disc 5, bag holders 6, vibration compactors 7, and the like. The frame 2 is connected with the supporting upright post. The rotation driving mechanism 3 is fixed in the middle of the frame 2. The charging barrel is fixed on the frame 2 and is positioned at the outer side of the rotation driving mechanism 3. The rotary disc 5 is fixed at the lower end of the rotation driving mechanism 3 and is provided with a plurality of blanking barrels. The lower end of each blanking barrel is fixed with one bag holder 6. The vibration compactors 7 are positioned at the outer side of the bag holders 6 and are distributed in a circle having a center which is the rotation center of the rotary disc 5. With a rotary structure, the packing machine automatically separates the actions in a process of filling the powder materials into bags and all actions can be carried out at the same time, thereby eliminating time for waiting for the air exhaust of the materials. Therefore, the rotary semiautomatic packing machine can improve product efficiency greatly and improves operational environment.