Submersible pump with cutter is an ideal machine for draining sewage. A high-speed rotating cutter is assembled at the inlet hole of the pump, make it easy to cut off long-fibre and firm sundries contained in the sewage, so as to avoid the impeller is blocked by the entanglement. It is suitable for draining sewage in sanitation, factory, mine and family, The float switch can automatically control on and off with the change of the liquid level. The protector in the motor can automatically cut off the power when it is overheated or overloaded, thus guarantee the security and reliability of pump’s run even in the atrocious environment.