The invention discloses an electronic draft system of a spinning machine. According to the technical principle of the electronic draft system, a mechanical linkage between a main shaft and a draft system is broken, a mechanical mechanism of a complicated draft gear drive system is omitted, a servo motor, a variable frequency motor and a reducer are used for directly driving a front roller, a middle roller and a rear roller, and a PLC (Programmable Logic Controller) and electronic programs are used for controlling the operation and process adjustment of the rollers so as to ensure that the rollers are in coordination with the whole machine. The electronic draft system has the beneficial effects that the load of the whole machine is decomposed, and the mechanical mechanism of the complicated draft gear drive system is simplified by virtue of servo and frequency conversion technologies; the adjustment of a draft process is convenient, rapid and accurate; and the loss and maintenance costs of parts can be reduced, and the quality level of products can be stabilized.