The invention discloses an ultrasonic scanning apparatus for cracks on a steel induction heat bend, which belongs to the field of detection technology for an induction heat bend of an oil-gas pipeline. The scanning apparatus comprises a bracing frame, an arc track and a crawling scanning device, wherein the arc track is fixed on a center line of the steel induction heat bend through the bracing frame, and the crawling scanning device is mounted on the arc track and can walk and rotate in the steel induction heat bend along the arc track. The ultrasonic scanning apparatus provided by the invention can carry out circumferential automatic ultrasonic scanning on the inner wall of the steel induction heat bend through the crawling scanning device capable of carrying out accurate centralized positioning and location positioning, is convenient to install and satisfies technical demands for a fast speed, a high detection rate and the like by quality detection of pipe sections in production of the steel induction heat bend.