Pull-out detection pen and detection platform

The utility model relates to a drawing type detection pen. The device comprises a first shell and a detection rod which is drawn and moved relative to the first shell, the first shell is provided witha first inner cavity for accommodating the detection rod, a flexible diaphragm which is drawn and moved relative to the first shell is arranged at the bottom of the first inner cavity, and detectiontest paper which is used for reacting with the detection rod is arranged between the flexible diaphragm and the first shell; the utility model also relates to a detection platform. And the second shell comprises a second shell body, the second shell body is provided with a second inner cavity used for containing the detection pen, a control module is arranged below the second shell body, the control module is electrically connected with the plurality of photoelectric detection heads, and the bottom of the second shell body is provided with a plurality of second through holes used for connecting the probes with the seco