An entrance guard system based on radar sensing and image recognition comprises a radar detection module, a mixer, an amplifier, a delayer, and a starting circuit which are cascaded in sequence. The output end of the starting circuit is connected with an illuminating lamp switch through a first relay. The output end of the starting circuit, a second relay, a picture collection module, and a microprocessor are sequentially connected with each other. The output end of the microprocessor is connected with an electronic lock of the entrance guard system. A radar detection module detects echo signals reflected by people entering the detection area, and the echo signals sequentially pass through the mixer, the amplifier, and the delayer to form a starting signal. The starting signal is sent to the input end of the starting circuit, and the starting circuit controls the first relay to pull the illuminating lamp switch in according to the starting signal; and meanwhile, the starting circuit triggers the picture collection module to collect pictures of people entering the detection area, and sends the pictures to the microprocessor. The electronic lock is opened after the microprocessor recognizes the character in the pictures. According to the entrance guard system based on radar sensing and image recognition, the automatic opening and closing of a door can be realized, and the illuminating control can be realized when the door is opened.