The invention discloses a liquid line system applied to a hematology analyzer. The liquid line system comprises a liquid line substrate, wherein the liquid line substrate is provided with a first surface, a second surface opposite to the first surface, and a side face which is connected with the first surface and the second surface; flow guide grooves in which liquid flows and interconnects are formed in the first surface and the second surface; a plurality of liquid ponds which are connected with the flow guide grooves are also formed in the first surface; transferring heads penetrating through the flow guide grooves are mounted on the side face; reagents and samples to be detected are connected through a rubber tube and the transferring heads. Through the liquid line system of the hematology analyzer, the overall integration can be effectively realized; the liquid line system of the hematology analyzer is convenient to disassemble and maintain; meanwhile, the overall weight is reduced, the volume is decreased, and the portability is improved.