Abstract: A static random-access memory and a fault detection circuit thereof are provided. The fault detection circuit includes: a bit line coupling circuit, coupled between a first bit line and a second bit line, wherein the bit line coupling circuit is adapted to use a bit line with a lower potential between the first bit line and the second bit line to couple a bit line with a higher potential between the first bit line and the second bit line to a floating low potential in response to performing the data write operation on the memory cell in a test mode by the write circuit; and a fault determining circuit, adapted to, in response to the memory cell being at the test mode, obtain and compare write data and read data corresponding to the write data, to determine whether the SRAM has a Data Retention Fault based on a comparison result.