Optical inspection mechanism for PCR instrument

The utility model discloses an optical inspection mechanism for a PCR instrument. INCLUDING AN OPTICAL INSPECTION BASE, the optical inspection base is provided with a horizontal hole and a vertical hole; a two-way spectroscope is mounted at the junction of the horizontal hole and the vertical hole; a PD photosensitive diode is arranged below the vertical hole; a receiving optical filter and a first plano-convex lens are sequentially arranged between the two-way spectroscope and the PD photosensitive diode, a second plano-convex lens is arranged at the upper end of the vertical hole, a light source assembly is arranged at one end of the horizontal hole, and a collimating lens and an excitation optical filter are sequentially arranged between the light source assembly and the two-way spectroscope. Due to the adoption of the integral optical inspection base design, the processing precision is high, the assembly precision is high, and the coaxiality, the verticality, the parallelism and the transmittance of an op