ATM automatic reminding system with anti-card-retaining function

The invention discloses an ATM automatic reminding system with an anti-card-retaining function. The ATM automatic reminding system comprises an ATM machine and a door control system. A signal transmitter is arranged on the ATM machine in a signal connection mode. A signal receiver is arranged on the door control system in a signal connection mode. The signal transmitter and the signal receiver are connected through a wireless communication signal. The signal transmitter comprises a power supply module, an I/O isolation module, an MCU and a Bluetooth module. An ATM machine signal output interface, the I/O isolation module, the MCU and the Bluetooth module are connected in sequence. The I/O isolation module, the MCU and the Bluetooth module are connected with the power supply module respectively. The signal receiver comprises a power supply module, a Bluetooth module, an MCU and an I/O isolation module, wherein the Bluetooth module, the MCU and the I/O isolation module are connected with the signal input end of the door control system in sequence, and the Bluetooth module, the MCU and the I/O isolation module are connected with the power supply module respectively. The signal receiver further comprises a voice reminding module which is connected with the MCU of the signal receiver.