Advanced drilling and coring method for complex heterogeneous stratum

The invention discloses an advanced drilling and coring method for a complex heterogeneous stratum, and relates to the technical field of drilling and coring, and the coring method comprises the following steps: step 1, before drilling, an adjusting mechanism drives a drilling cutter to move in a direction far away from the center end of a coring opening; secondly, driving equipment is started to drive a drill rod body to rotate, and a drilling cutter is synchronously driven to rotate to cut soil; thirdly, the adjusting mechanism drives the drilling and cutting tools to move in the direction close to the center end of the coring opening, so that the drilling and cutting tools seal the coring opening and support soil located in the drill bit end; fourthly, the drill rod body is taken out of the soil, and coring is completed; in the drilling process, soil enters the drill bit end through the coring opening, and then the adjusting mechanism drives the drilling cutters to move towards the direction close to the c