The utility model provides an entrance guard's card for indoor positioning and alarming, includes the shell, installs power, RFID chip in the shell, still installs controlling means, wifi communication module, sets up the through -hole on the shell, alarm button installs and is connected with controlling means in the through -hole, RFID chip, wifi communication module, alarm button link to each other with controlling means. Current RFID is different with wifi's communication frequency, and RFID channel and the location position of trigger connecting communication in order to confirm entrance guard's card place are crossed to entrance guard's cartoon, the strong and weak information of communication signals between entrance guard's card and the AP node was received to another channel and APnodal connection communication, server, can calculate the position at entrance guard's card place.