Continuous-wave　terahertz　digital　holography　(TDH)　is　a　booming　full-field　phase-contrast　imaging　method　validated　in　both　in-line　and　Mach-Zehnder　off-axis　geometries.　In　this　Letter,　a　self-referencing　TDH　approach　is　proposed　based　on　the　Fresnel＇s　mirrors,　by　which　the　object　wavefront　is　partitioned　and　reflected.　Two　beams　interfere　with　each　other　to　form　an　off-axis　hologram.　The　proposed　recording　configuration　is　immune　from　a　superposed　twin　image　and　has　higher　temporal　stability　than　Mach-Zehnder　interferometers.　To　evaluate　the　phase-contrast　imaging　performance,　different　types　of　samples　are　measured.　(C)　2020　Optical　Society　of　America