The invention relates to a pinion and rack type film hole punching device which comprises a frame, a hole puncher, a driving shaft and a chain wheel, wherein the hole puncher is vertically and slidingly mounted on the frame, and a rack is fixedly connected on the lateral side of the hole puncher. The driving shaft is linked with a cam rocker arm, a gear flange contact wheel is assembled at the end of the cam rocker arm, and the cam rocker arm is fixedly linked with an opening flange contact arm. The gear is assembled on the driven shaft and a gear flange is arranged on the lateral side of the gear. A large torsional spring and a limiting plate are assembled on the driven shaft. In the invention, when in use, the hole puncher can meet the requirements of hole punching, vertical earthing and unearthing, and the passive opening of the flange of the hole puncher can be changed into the active opening, thereby the seeding leakage is avoided, and the problem that the seeds are sown in the inclined downside of the hole punching position is solved.