Function testing device and system

The utility model provides a function testing device. The function testing device comprises a box body; the analog resistor comprises a fixed-value resistor and a variable resistor, and the fixed-value resistor and the variable resistor are located outside the box body in the form of a resistance adjusting knob or a button and are used for adjusting the resistance value required by the test function control signal source; the control module is electrically connected with the fixed-value resistor and the variable resistor through different functional pins and is used for outputting or stopping outputting a functional control signal source; the power supply module is electrically connected with the analog resistor and is used for providing independent power supply; wherein the control module inputs different function control signals according to requirements so as to realize corresponding function tests. The utility model relates to a novel function test device for a power system of a new energy automobile, whi