Baling machine compression cylinder, double acting cylinder; To achieve horizontal compression of straw when baling. The buffer structure is designed to ensure the smooth operation of the cylinder at high frequency. The cylinder adopts high-strength cold-drawn tube, and the inner hole is scraped and rolled once to ensure the coaxial and straightness accuracy of the inner hole, and improve the operation efficiency and smoothness of the whole cylinder. Lightweight design, reduce cylinder weight; The sealing parts are imported brands with stable sealing reliability and long service life.