The invention discloses a detection light dual-mode imaging system of integrating non-contact photoacoustics and optical coherence tomography. The system includes a computer, a photoacoustic excitation module, a common detection end module, a common reference arm module, a sample arm module, a photoacoustic imaging data acquisition module and an OCT detection module; a detection light signal passes through a second focusing lens, an X-Y scanning galvanometer, a dichroic mirror and a third lens in sequence, and returns to a coupler to conduct interference on light returning from the common reference arm module, and a first interference signal passes through a circulator and the OCT detection module in sequence, and is transmitted to the computer; excitation light emitted by an excitation light source passes through a second reflector, a first focusing lens, a focus adjusting lens andthe dichroic mirror, and is combined with the detection light to form coaxial light, and a second interference signal passes through the circulator, a balance detector and a high-pass filter in sequence, and is transmitted to a data acquisition card. According to the detection light dual-mode imaging system of integrating non-contact photoacoustics and optical coherence tomography, an existing non-contact OCT-PA multimode imaging system is improved, and the system structure is simplified.