Aiming at the development demand of garment industry, the control system of the directdrive discal knife cutter was developed by using brushless DC motor (BLDCM) drive technology to improve the comprehensive performance. The total hardware circuit of the digital controller was composed of the singlechip microcomputer and peripheral circuit, power and drive circuit, Hall position detection circuit, operating circuit and auxiliary power supply. The speed closedloop control strategy and control program were designed according the performance of directdrive BLDCM and the working characteristics of discal knife cutter. The load test experiment proved that the speed regulation performance was accurate and efficient. The blocking test proved that the overcurrent protection during stalling was fast and reliable.