The invention provides a high-stability annular inductor. The high-stability annular inductor comprises an annular magnetic core, a first winding coil, a second winding coil, a reinforcing frame and abase assembly. The first winding coil is wound on one side of the annular magnetic core, and the second winding coil is wound on the other side of the annular magnetic core. The reinforcing frame comprises two sub-frames. The sub-frame comprises a top beam, a middle beam, a bottom beam and side rods. The two top beams are connected in a clamped mode, the two middle beams are connected in a clamped mode, the two bottom beams are connected in a clamped mode, and the two side rods abut against the two sides of the annular magnetic core respectively. The base assembly comprises a base body, two first bearing sleeves, two first pins, two second bearing sleeves and two second pins. The base body is provided with a fixing slot and an arc-shaped limiting groove, the annular magnetic core is partially contained in the arc-shaped limiting groove, and the two bottom beams are inserted into the fixing slot and connected with the base body in a clamped mode. Each first bearing sleeve is accommodated in one first adjusting groove and is in sliding connection with the seat body, and each first pin penetrates through one first bearing sleeve. According to the annular inductor, the stability performance is improved.