The invention discloses a vehicle instrument circuit board combined detection table and a detection method thereof. The detection table comprises an instrument circuit board combination on the detection table and is characterized by being internally provided with the instrument circuit board combination by the connection of a testing neilsbed and a testing signal source and a detection circuit composed through a testing neilsbed. The detection circuit is connected with an analog circuit board combination through an output interface of a testing desk. By adopting the technical proposal, the invention provides a complex equipment characterized by having the advantages of general use, standardization, multiple functions, convenient and reliable use and operation and exact output, realizes complex requirements on the compatibility and functions of products, leads a plurality of modes of switches, frequency and voltage and the like to be available to signal output selectively and realizes aplurality of parameter selection functions. The product is simple in structure and improves product reliability improved and simultaneously reduces product cost. The product improves the detection efficiency in the production process of instruments, reduces use cost and equipment cost investment and is convenient for the collinear production of multiple varieties or the quick shift among different teams and groups.