Single multi-angle two-stage profiling header and profiling method

The invention relates to a single multi-angle two-stage profiling header and a profiling method. The header comprises a flexible transmission device, a first-stage profiling device, a second-stage profiling device and a multi-angle terrain detection device. The first-stage profiling device is installed on the whole machine frame and is combined with the flexible transmission device, and control over up-down floating of the single header in the vertical direction and front-back inclination in the harvesting direction is achieved. A multi-angle driving device is installed in the second-stage profiling device and used for actively controlling the bottom header to incline in different directions, and the functions of multi-angle ground attachment and real-time profiling of the bottom of the header are achieved. A plurality of grounding detection single bodies are distributed at the bottom of the header in the circumferential direction in an array mode, and terrain surface fluctuation information of the current ha