The invention discloses a household flour mill. The household flour mill comprises a box body, a motor, a grain feeding and flour discharging shaft and a flour making part, wherein the motor and bearing supporting ear plates are fixed on a supporting plate in the box body; a driving wheel is fixed on an output shaft of the motor; the grain feeding and flour discharging shaft is inserted into bearing holes in the two bearing supporting ear plates and consists of a bearing, a transmission wheel, an annular grain feeding and flour discharging joint, a grain feeding and flour discharging guide pipe and a shaft; a flour guide pipe insertion hole and a grain feeding hopper insertion hole are formed in the annular grain feeding and flour discharging joint; a grain feeding hopper and a flour guide pipe are inserted into the upper part and the lower part of the annular grain feeding and flour discharging joint respectively; the flour making part is rotationally mounted on the grain feeding and flour discharging shaft and consists of a connecting cone cylinder, a chuck, a screen and a flour making cylinder; a grinding ball is mounted in the flour making cylinder. Due to continuous and automatic discharging, the household flour mill is simple and convenient to operate, lower in rotation speed, low in noise and compact in structure.