Position identification card for downhole personnel in coal mine and card reading mode

The invention relates to a position identification card for downhole personnel in a coal mine and a card reading mode. A central processor is arranged in an identification card and connected with a low-frequency receiving and transmitting module, a high- frequency receiving and transmitting module and a power supply module. The card reading mode comprises the following steps: a plurality of mine substations established downhole cover the card reading area through low-frequency signals, the identification card keeps watch the commands of the mine substations through the low-frequency module; when the identification card enters the coverage area, communication with the mine substations is established and the card number is sent to the mine substations, the mine substations perform verification and storage processing and send a card disabling command to the identification card, and the identification card automatically enters the next round of watchkeeping after 30 seconds after disabling. The identification car