The invention provides a transmission system for a drawing device for a coiler of a cotton carding machine. The transmission system comprises the drawing device, a driving lump roll, a driven lump roll, a coiling plate, a sliver can bottom plate, a transmission motor and transmission mechanisms, and is characterized in that the transmission motor is a variable frequency motor; the transmission mechanisms of the drawing device, the lump rolls, the coiling plate and the sliver can bottom plate are just driven by the variable frequency motor; and the transmission mechanisms of a front drawing roller, a middle drawing roller and a rear drawing roller in the drawing area of the drawing device are arranged on the same side. The transmission system has the advantages that the structure is simple; the transmission is smooth and reliable; the transmission efficiency is high; and the maintenance and the operation are convenient.