The utility model discloses a biological assay testing arrangement relates to the experimental apparatus field. This experimental apparatus, including testing arrangement main part and operation panel, the embedding of the top left and right sides of operation panel has unable adjustment base, and unable adjustment base's top is fixed with the fixed block, and the inboard of fixed block is fixed with the dead lever, and the equal swing joint in the outside of dead lever has three evenly distributed's a movable block, and the top of left movable block is fixed with the formation of image board,and the top swing joint of movable block has the activity circle in and. This kind of biological assay testing arrangement has set up the movable block, and the movable block passes through control block swing joint, and just three movable block is the distribution of " parallel " structure, through control block control movable block, lets testing arrangement not need manual removal movable block, and it is poor to prevent minor data to appear in the experiment, leads to the data are generated error after the experiment, has improved operating mass with rated load.