The present invention provides an automatic elevator call system and a method for requesting an elevator service, belonging to the field of elevator intelligent control technologies. The automatic elevator call system of the present invention includes a wireless signal apparatus that is installed in an elevator system and broadcasts a corresponding wireless signal around, wherein the automatic elevator call system detects the wireless signal and a signal strength value thereof by using a personal mobile terminal carried by a passenger, and automatically sends an elevator service request command to the wireless signal apparatus when the signal strength value is greater than or equal to a predetermined threshold. The wireless signal apparatus wireless signal apparatus. The present invention can further improve elevator call experience of passengers.