The invention discloses a system and a method for testing the parameters of a temperature control box. The system includes an industrial personal computer which is equipped with test system industrial personal computer software. A DC regulated power supply, a function signal generator, a universal counter, a dual-trace oscilloscope, a data collector and other system devices are connected to the industrial personal computer through an Ethernet HUB, a GPIBUSB card, a USBRS232 cable and a network cable to achieve functions such as system self-check and automatic test state record. The DC regulated power supply is electrically connected to a device under test DUT. The function signal generator, the universal counter, the dual-trace oscilloscope and the data collector are correspondingly connected to the signal ports under test of the device under test DUT through the electrical signal detection ports thereof. Compared with the prior art, the advantage is as follows: through the system and the method, the output zero voltage, the maximum output voltage, the total magnification and other test indicators of a temperature control box product can be tested.