The utility model discloses a fully mechanized caving face multi-coal-caving-port group coal caving simulation device which comprises a primary coal caving simulation sub-mechanism and a secondary coal caving simulation sub-mechanism which are connected end to end and arranged in parallel. The primary coal caving simulation sub-mechanism comprises a primary coal caving fixing frame, a primary coalcaving tail beam and a primary kerosene caving cylinder, the primary kerosene caving cylinder is fixedly connected to the primary coal caving fixing frame, and the primary coal caving tail beam is fixedly arranged on a piston rod of the primary kerosene caving cylinder and telescopically moves along with the piston rod; the secondary coal caving simulation sub-mechanism comprises a secondary coalcaving fixing frame, a secondary coal caving tail beam and a secondary kerosene caving cylinder, the secondary kerosene caving cylinder is fixedly connected to the secondary coal caving fixing frame,and the secondary coal caving tail beam is fixedly arranged on a piston rod of the secondary kerosene caving cylinder and telescopically moves along with the piston rod; the primary coal caving fixing frame is provided with a step pitch adjuster at the rear end of the primary coal caving oil cylinder, and the step pitch adjuster abuts against the front end of the secondary coal caving tail beam.The simulation method is executed by the simulation device.