Drinking water packaging bag

The invention provides a drinking water packaging bag. The packaging bag comprises a bag body, a first guide pipe, a second guide pipe, a third guide pipe, a three-way valve and a tap, wherein a partition layer is arranged in the middle of the bag body, the partition layer divides the bag body into two chambers, the first guide pipe is connected to the outside of the first chamber, the second guide pipe is connected to the outside of the second chamber, one ends, far away from the bag body, of the first guide pipe and the second guide pipe are connected with a first port and a second port of the three-way valve respectively, a third port of the three-way valve is connected with the third guide pipe, one end, far away from the three-way valve, of the third guide pipe is connected with a faucet, and when a valve of the three-way valve is rotated to enable the first guide pipe to communicate with the third guide pipe, drinking water in the first chamber is drained from the faucet, or enable the second guide pipe