The invention relates to a biological sampling robot system comprising a base; a refrigerator is arranged on the base, an aperture is cut on the top of a storage box of the refrigerator, a liftable platform is arranged inside the storage box and rightly under the aperture, a mechanical hand device is arranged at one side of the refrigerator, an ink-jet fight code machine is arranged at the front of the mechanical hand device, an air extracting system arranged at one side of the mechanical hand device and a plate mechanism arranged on a side base of the mechanical hand device, wherein the air extracting system is communicated with the plate bottom of the plate mechanism through a pipeline and is connected with an air extracting pipeline, and an opening of the air extracting pipeline is arranged in the middle of mechanical claws of the mechanical hand device. The biological sampling robot system has precise mechanical design, stable work and high precision of transmission system, and can realize the ordered processes of taking and placing sampling plates with accurate positioning.