Abstract: A pickup mechanism, paper currency processing machine and sheet medium processing device are provided. The pickup mechanism includes a pickup roller (1). The pickup roller (1) includes a shaft (11) and a sleeve (12), a part of a periphery of the sleeve (12) includes a high-friction part (122). The pickup mechanism further includes a detecting component (5). The detecting component (5) includes a detecting disc (52) coaxially and fixedly connected with the shaft (11), and a sensor (51) matched with the detecting disc (52), and a position detecting aperture (521) is arranged on the detecting disc (52). An end position of the position detecting aperture (521), matched with the sensor (51), is associated with a position where the high-friction part of the pickup roller is located along a rotation direction of the detecting disc (52), so as to control a rotation stop position of the pickup roller (1).