The invention relates to the technical field of petroleum and natural gas well drilling and coring, in particular to an inner bushing puller of a shape protection coring tool. An outer diameter locking section of the puller and the right end of an inner diameter locking section of puller are connected, the right end of a plastic bushing is inserted into a clearance between the outer diameter locking section and the inner diameter locking section, the left end of a central screw rod is connected with an inner diameter tension elastic sheet, the outer edge of the inner diameter tension elastic sheet is clamped in an inner step of the outer diameter locking section, a locating press plate is in screwed connection with the central screw rod and is connected with an outer diameter thrust locking sleeve through a thrust bearing, the outer diameter thrust locking sleeve is arranged on the outer diameter locking section in a sleeved mode and is clamped on an outer step of the outer diameter locking section, the right end of the central screw rod is sleeved with an upper thrust plate, a thrust base plate is connected to the outer wall of an inner barrel, and the thrust base plate is connected with the upper thrust plate through a thrust rod. A plastic inner bushing and a rock core can be pulled out of the inner barrel together, the success rate is high, the structure is simple, the operation is convenient, and safety and reliability are achieved. The defect that an existing plastic inner bushing is difficult to pull out of the inner barrel is overcome.