Carrying platform of substrate box

The invention discloses a carrying platform of a substrate box, which also comprises a detection unit, wherein the detection unit comprises a photoelectric sensor, a sensor bracket, a sensor reflecting plate, a sensor baffle plate, a suspension shaft and a control device. The sensor bracket is installed on a second support plate, the sensor reflecting plate is installed on the second support plate, the photoelectric sensor is arranged below the sensor reflecting plate and is electrically connected with the control device, a through groove is arranged on the second support plate, the sensor baffle plate is provided with a first bending part and a second bending part which extend along opposite directions, the sensor baffle plate slantways penetrates through the through groove, the bending position of the first bending part is arranged on the suspension shaft, the suspension shaft is connected on the second support plate, the first bending part protrudes slantways and upwards out of theupper end of the through groove, and the second bending part protrudes slantways and upwards out of the lower end of the through groove and is adjacent to an optical path formed by the photoelectric sensor and the sensor reflecting plate. The invention can effectively prevent a substrate from falling off from the inside of the substrate box and can greatly enhance the transmission efficiency and quality of the substrate.