The invention relates to a horizontal adaptive mechanical precision straightening device for linear bars. The straightening device provided by the invention comprises a main engine foundation, a left-workpiece presence sensor, a right-workpiece presence sensor, a support / drive
assembly, a straightening mechanism, a left feed mechanism, a right feed mechanism, an
axial displacement meter, a workpiece bending-modulus
measurement device, a left workpiece clamping
assembly, a right workpiece clamping
assembly, a straightening
stroke displacement meter and an electrical /
software processing controlsystem, wherein the left-workpiece presence sensor, the right-workpiece presence sensor, the support / drive assembly and the straightening mechanism are connected with the main engine foundation; the left feed mechanism and the right feed mechanism are respectively arranged at the two sides of the main engine foundation; the
axial displacement meter and the workpiece bending-modulus
measurement device are connected with the support component of the support / drive assembly; the left workpiece clamping assembly and the right workpiece clamping assembly are respectively connected with the two sides of the support component; the straightening
stroke displacement meter is connected with the straightening mechanism; and the electrical /
software processing control system is used for controlling thecomponents to operate. By using the precision straightening device provided by the invention, the continuous bending of a workpiece can be subjected to straightening on
adaptive support-span adjustment and straightening
stroke adjustment, the length of the workpiece is not restricted, the rigidity of a mechanical dynamical mechanism is large, and the precision of closed-loop
servo control on support span and straightening stroke is high without being affected by the gravity deformation of a long workpiece in the vertical direction.