Medicine powder propelling device, medicine bottle and bottle cap of medicine bottle thereof wherein the medicine powder propelling device includes a medicine bottle and a gas supply part

The invention relates to a medicine powder propelling device, which comprises a medicine bottle and a gas supply part. The medicine bottle has a bottle body and a bottle cap. The bottle body has a bottleneck and is filled with a medicine powder. There is an unfilled space not filled with the medicine powder when the bottle body is turned upside down. The bottle cap includes a cover, a medicine delivery tube and a gas supply tube. The cover has a top and a cover part opposite to the top. The cover is set on the bottle body to close the bottleneck. The medicine delivery tube extends into the cover from the top. The medicine delivery tube has a drug inlet end that penetrates the top and communicates with the bottleneck. The gas supply tube extends into the cover from the top. The gas supply tube has a gas supply end that penetrates the top, protrudes from the cover and extends into the bottle body from the bottleneck. The gas supply end extends into the unfilled space. The gas supply part is connected with the g