The inventive embodiment relates to a device and a method for search key value generation. By using multiple programmable control search key value generation units in parallel to generate multiple search key values, the invention solves the problem that high-speed massage forwarding has higher performance requirement for massage classification search key value generation device than to software generation search key value device; microcode instruction set special for comparison is designed, the inputted massage data and the processing result of preceding stage circuit are processed in three granularities by microcode instruction program, thus the flexibility requirement for search key value generation unit is met, and the difference requirement for massage classification from different network deploying strategies and different clients.