A pumping unit (1) comprising: a plurality of micropumps (500) arranged in a lattice design with rows (m1-m5) and columns (n1-n5), transferring the micropumps (500) a fluid in one direction length of the columns (n)； an integrated discharge orifice (50) to which a discharge orifice (542) of at least one micropump (500) arranged in a lower row (m1) is connected directly, the integrated discharge orifice (50) receiving the fluid transferred by the micropumps (500) to finally discharge through the integrated discharge port (50)； characterized in that it further comprises: a direct connection discharge mechanism (70) that is adapted to connect respective discharge holes (542) of the plurality of micropumps (500) in an intermediate row (m2-m5) directly to the discharge hole integrated (50)； a direct connection intake mechanism (80) that is adapted to connect respective intake ports (544) of the plurality of micropumps (500) in the intermediate row (m1-m4) directly to an integrated intake port (60)； a series connection mechanism (90) that is adapted to connect a discharge port (542) of a micropump (500) in an upward row (m2-m5) directly to an intake port (544) of a micropump ( 500) in a row down (m1-m4)； and a controller (10) for controlling the direct connection discharge mechanism (70), the direct connection admission mechanism (80), and the serial connection mechanism (90), in which the controller (10) is adapts to control the serial connection mechanism (90) to connect the discharge orifice (542) of the micropump (500) in the upward row (m2-m5) directly to the intake port (544) of the micropump (500 ) in the downward row (m1-m4) through the serial connection mechanism (90) to form a connection in one direction of the columns (n1-n5), thus placing the plurality of micropumps (500) in a state of preferred pressure transfer (Figure 5B), and to control the direct connection discharge mechanism (70) for connecting the discharge orifices (542) of the micropumps (500) in a p
