The invention provides a packaging bag convenient to take. The packaging bag comprises a bag body as well as a storage cavity and a sliding cavity which are formed in the bag body, wherein an operation cavity is formed in the left side wall of the sliding cavity, a communication hole is formed between the operation cavity and the storage cavity, a rotating shaft is rotationally arranged in the storage cavity, a plastic bag winds around the outer surface of the rotating shaft, and a stretching device is arranged in the sliding cavity. The packaging bag is convenient and safe to operate, takingof plastic bags of any length is achieved, and utilization of plastic is reduced; besides, an opening of the packaging bag can be automatically opened, and utilization is convenient.