This invention relates to an automatic distribution devices of the various liquid in biological engineering, including: fluid absorption device, pushing fluid device, solution database, reaction pool, and more links-connection, the four-link, plastic hoses, electromagnetic trap, air filters, liquid saving cavity which has a liquid inlet, a gas inlet and a fluid outlet. The liquid inlet links to sample solution database and the fluid outlet connects with reaction pool. Plastic hoses connect the various components and the electromagnetic traps control plastic hoses. Use of the invention can achieve the distribution of a variety of liquid, high-precision parallel, and meet the needs of automated prototype sampling in the process of DNA computing the reaction solution.