Gate pump with flood drainage and diversion irrigation two-way water diversion and drainage functions

The invention discloses a gate pump with the flood drainage and diversion irrigation two-way water diversion and drainage functions. The gate pump comprises a gate used for partitioning a riverway, animmersible pump used for water drainage and diversion, a lifting mechanism used for driving the gate to rise and fall, two restraining rails arranged at the two side edges of the gate correspondinglyand used for limiting the gate, and a reversing device used for driving the immersible pump to conduct reversing to achieve the two-way water diversion and drainage functions, wherein the immersiblepump is connected into the gate. Flap valve devices are arranged at a water inlet and a water outlet of the immersible pump correspondingly so as to achieve two-way sealing and cooperate with the two-way water diversion and drainage functions. According to the gate pump, only one immersible pump and one gate are adopted, and the flood drainage and diversion irrigation two-way water diversion and drainage functions can be ac