Compression tensioning type locking device and crank lock

The invention relates to a compression tensioning type locking device and a crank lock, the compression tensioning type locking device comprises a lock box, a lock driving shaft, a lock transmission assembly and a pre-tensioning locking mechanism, the lock driving shaft is positioned and rotatably matched in the lock box, the lock driving shaft drives the lock transmission assembly, and the pre-tensioning locking mechanism comprises a driving gear, a guide assembly and a pre-tensioning locking component with a lock head; the lock head is arranged towards the top of the lock box, the lock driving shaft drives the driving gear to rotate, the driving gear is in meshing transmission with a rack part of the pre-tightening locking component, the pre-tightening locking component is configured to be capable of moving along a preset track relative to the lock box under guiding and limiting of the guiding assembly, and the preset track has two moving directions; the two moving directions are the loosening and tightenin