The invention provides a scraper blade chain track flatness detecting device for a semi-portal type scraper blade reclaimer. The device comprises bases, first guide plates, cross beams, steel pipes and second guide plates; two cross beams are adopted and are symmetrically arranged; the steel pipes are arranged between the two cross beams and are used for connecting the two cross beams; two secondguide plates are adopted and are disposed at the centers of each of the cross beams respectively; four first guide plates are adopted and are symmetrically disposed at two sides of the second guide plates; and four bases are adopted and are respectively fixed at one end of each of the first guide plates which is away from the corresponding second guide plate. According to the scraper blade chain track flatness detecting device for the semi-portal type scraper blade reclaimer provided by the invention, two bases are symmetrically disposed at the bottom end of each cross beam, and two second guide plates are symmetrically disposed at the bottom end of each cross beam, and therefore, the device can detect whether the gauge of the chain track is equal through the two bases when detecting the flatness of the chain track, and therefore, the device has a wide application range.