The utility model relates to a variably fix a position sheet metal special fixture based on manual dovetail slip table, be anchor clamps bottom plate (1) including the hole, a plurality of cross sliding table positioning mechanism s of setting on the hole is anchor clamps bottom plate (1), cross sliding table positioning mechanism includes cross sliding table, the hole of setting on cross slidingtable is that chuck bottom plate (5) and chuck support (7) of connection on the hole is chuck bottom plate (5) are constituteed, chuck support (7) are used for connecting the sheet metal anchor clamps, the manual dovetail cross sliding table of cross sliding table for taking the rocker, chuck support (7) are that chuck bottom plate (5) are connected and are upwards fixed a position at cross sliding table Z through special -shaped stud (6) of transversal personally submitting " D " type with the hole. Compared with the prior art, the utility model has the advantages of satisfy different sheet part location position, variable location tactics and can improve flexible deviation analysis precision in assembling process.