A folded substrate integrated waveguide wideband band-pass filter loaded with a T-shaped defected ground relates to a substrate integrated waveguide wideband band-pass filter, and specifically relates to a folded substrate integrated waveguide wideband band-pass filter loaded with a T-shaped defected ground. The invention aims to solve the problem that the development of an ordinary substrate integrated waveguide band-pass filter in a mobile communication system is limited due to high working frequency and narrow bandwidth. The folded substrate integrated waveguide wideband band-pass filter comprises a dielectric substrate, a first micro-strip line, two second micro-strip lines, two first T-shaped defected ground structures, two second T-shaped defected ground structures, and five third T-shaped defected ground structures. The dielectric substrate is composed of a rectangular plate and a semicircular plate, and the right end of the rectangular plate and the straight edge of the semicircular plate are connected as a whole. The first micro-strip line is printed on the right end of the front of the rectangular plate, the two second micro-strip lines are respectively printed on the two sides of the left end of the rectangular plate, and the right end of each second micro-strip line is connected with the first micro-strip line. The folded substrate integrated waveguide wideband band-pass filter of the invention is used in the field of wireless communication.