Massive　usage　scenarios　prompt　the　prosperity　of　terahertz　(THz)　reflective　imaging　methods.　In　this　Letter,　we　apply　ptychography　to　continuous-wave　THz　reflective　imaging.　Our　scheme　has　a　compact　lensless　layout　and　uses　a　fullfield　oblique-illumination　recording　mode.　Diffraction　patterns　are　corrected　through　tilted　plane　correction.　This　method　can　be　used　to　retrieve　the　complex-valued　object　function　and　to　suppress　the　negative　effect　of　non-uniform　illumination.　The　feasibility　is　investigated　using　two　metal　samples.　(C)　2020　Optical　Society　of　America