The utility model discloses a clearance adjustable inertia cone crusher includes fixed cone subassembly and mantle subassembly, the fixed cone subassembly include the ring form fixed cone body (1), support ring (3), gear wheel (4), pinion (5), little gear drives and fixed cone locking mechanism (2), the fixed cone body (1) outer cob loaf draw together the external screw thread, gear wheel (4) are fixed to the up end, support ring (3) be fixed in inertia cone crusher's frame on, the hole is equipped with the internal thread with the fixed cone body (1) matching the external screw, installs pinion (5) on support ring (3), little gear drives passes through pinion (5) drive gear wheels (4) and drives the fixed cone body (1) the relative support ring of rotation (3) rotation and go up and down, adjusts the clearance of fixed cone subassembly and mantle subassembly, the relative rotation and the elevating movement of locking on support ring (3) or loosening the fixed cone body (1) and support ring (3) is located in fixed cone locking mechanism (2). Simple structure, the adjustment is convenient, the whole inertia cone crusher's of the fast enough speed adjusting of ability the mantle subassembly and the clearance of fixed cone subassembly.