The invention relates to the technical field of 
valproic acid blood drug level monitoring, and specifically discloses a 
valproic acid homogeneous-phase 
enzyme immunity rapid detection kit. With derivative synthesis, 
valproic acid is connected onto 
bovine serum albumin (BSA), such that an immunizing 
antigen is obtained. An obtained polyclonal 
antibody has valproic acid specificity. Experiment data shows that when the 
reagent is used for detecting valproic acid, no cross reaction occurs between the 
reagent and other commonly used medicines; an analysis sensitivity is better than 25ng / ml; within-run precision and within-run precision coefficient of variability (CV) are both smaller than 4.7%; and compared with a 
fluorescence polarization 
immunoassay (EPIA) method, an R2 value reaches 0.98. The kit can be used in various 
routine analysis instruments. Because of characteristics of simple operation, high speed, low cost, and high sensitivity, with the kit, automatic detection can easily be realized. The kit assists in guiding clinical customized medication. With the kit, toxic or 
side effect of medicines is reduced, and 
curative effect optimization is realized.