The present invention discloses a crankshaft parameterized computer modeling system which comprises a foreground human-computer interface part and a background core computer part, wherein, the background core computer part comprises a welcome interface module, a main data structure initialization module, a graphical interface module, a button command button module, a file output module, a data check module, a dynamic help module and a clock module. The foreground human-computer interface part comprises a parameter conducting module, an input selection module, a parameter input module, an operating command selection module, a dynamic help module and a clock display module. The invention is characterized in 1) strong parameterized modeling capacity, 2) complete data error checking capacity,3) good human-machine interaction and 4) good compatibility and portability. The invention provides instructional advice for the adjustment of the finish machining and the machining technique, optimizes the machining technique, improves the finish machining efficiency and the machining quality of the crankshaft and the using efficiency of the crankshaft special lathe and reduces the manufacturingcost.