Disposable sampling pipe for collecting pathogenic liquid of livestock

The invention discloses a disposable sampling pipe for collecting pathogenic liquid of livestock. The disposable sampling pipe comprises a liquid storage pipe and a compressed air bottle, a piston isarranged on the top in the liquid storage pipe, an outlet pipe is arranged on the head portion of the piston, and a throttle valve is installed on the outlet pipe; an air inlet is formed in the bottomof the liquid storage pipe, a diaphragm is arranged in the air inlet, an air outlet of the compressed air bottle is connected with the air inlet of the liquid storage pipe through a flexible connecting pipe, and a top needle is vertically arranged at the bottom of the compressed air bottle, penetrates through the flexible connecting pipe, and makes contact with the diaphragm; the compressed air bottle is screwed at the bottom of the liquid storage pipe through a thread and can be screwed upward; compressed air is stored in the compressed air bottle, and the inside of the liquid storage pipe is vacuumized. The disposab