Small coaxial photoelectric detector

The utility model relates to the technical field of photoelectric detection, in particular to a small coaxial photoelectric detector. Comprising a TO base, a TO cap and a photodiode chip, and the TO base comprises a first pin, a second pin and a base carrier; the photodiode chip is electrically connected with the first pin and the second pin. The TO cap is arranged on the TO base to form a first cavity; the first pin is arranged on the axis of the center of the base carrier, a first boss is arranged at the end part of the first pin in the first cavity, and the photodiode chip is arranged on the first boss; the second pin is arranged on the edge of the base carrier, and the diameter of the first pin is different from that of the second pin, so that the positions and the diameters of the first pin and the second pin can be easily identified, and the risk of burnout caused by reverse connection of the photoelectric detector is avoided. According to the utility model, the first pin and the second pin are differen