The invention relates to an alarm device for an embroidery machine, which belongs to the technical field of additional devices of an embroidery machine. The alarm device comprises a wire through wheel and an alarm part, wherein the wire through wheel is mounted on a wheel base; the alarm part is mounted on the wheel base, and is on the same side of the wire through wheel; the alarm part comprises a hook structure, a fixing structure and a wire through groove, as well as an alarm contact spring and a sensor sheet used in coordination with the alarm contact spring; the hook structure is divided into a hook part and a main body; the wire through groove is formed by the groove between the hook part and the main body; the fixing structure is arranged on the main body; and the bottom of the alarm contact spring is mounted below the wire through wheel, while the top end is mounted on the fixing structure in coordination, and is used for fixing the alarm part. The alarm device for the embroidery machine, provided by the invention, has the advantages of high alarm accuracy, static electricity resistance, long service life and the like, and can be applied to computer embroidery machines and normal embroidery machines.