The degradable polycaprolactone (PCL) was selected as toughening phase to improve the toughness of polylactic acid (PLA), and a reinforced and toughened highly oriented PLA/PCL composite material was prepared by die drawing. The effects of different PCL contents and the tensile field introduced by die drawing on the material structure and properties were studied. The results of SEM show that PCL is distributed in the PLA matrix in the form of fibers under the drawing action, and the interface contact increases and the interface interaction increases. The results of mechanical properties show that the strength of PLA composites is greatly enhanced while improving the toughness of PLA, and the strength of the sample after drawing is much higher than that of the undrawn sample. When the mass fraction of PCL is 10%, the tensile strength and modulus of the composites after die drawing reach 168.3 MPa and 5488.4 MPa, which are increased by 280 % and 249.4 % respectively compared with those of pure PLA; the elongation at break reaches 34 % and is increased by 500 %.