Large-angle turning transportation system and turning method of heading machine

The invention provides a large-angle turning transportation system and a turning method of a heading machine. The large-angle turning transportation system comprises the heading machine, a scraper machine connected with the heading machine, longitudinal beams, a cross beam, connecting plates, a rotating arm, a single-side stand column and a secondary belt conveyor, wherein the connecting plates are fixedly mounted at the upper parts of two side plates of the scraper machine; the longitudinal beams are fixedly connected to the connecting plates; the cross beam is transversely spanned at the tail ends of the two longitudinal beams; a vertical shaft is arranged in the center of the cross beam; one end of the rotating arm is movably connected to the cross beam through the vertical shaft, and the side edge part of the other end of the rotating arm is vertically and fixedly connected with the single-side stand column; a horizontal shaft is arranged at the lower end of the single-side stand column; a connecting fram