Ultrasonic water meter external cable function test tool

The utility model discloses a function test tool for an external cable of an ultrasonic water meter, which comprises a mounting box body, and a development board, an adapter board and a TFT (Thin Film Transistor) liquid crystal display screen are respectively arranged in a cavity of the mounting box body; the development board is connected with a WIFI antenna through a punctual atom WIFI adapter plate, the adapter plate is provided with a USB integrated connection interface and is connected with other test equipment through the USB integrated connection interface, the side surface of the adapter plate is connected with a plurality of cable quick connectors, and the cable quick connectors are connected with the USB integrated connection interface. The upper surface of the installation box body is provided with a test result indicating lamp, an on-off button, a test starting button and a test stopping button. According to the structure, when the external cable is tested, the wire shifting work is omitted, a plu