Circuit of drainage pipe network liquid level measurement device

The invention discloses a circuit of a drainage pipe network liquid level measurement device. The circuit of the drainage pipe network liquid level measurement device comprises a single chip machine control circuit, a signal generating circuit and an output circuit. Basic circuits of the single chip machine control circuit comprises a CPU, a stabilized voltage supply modular circuit, a voltage filtration modular circuit, a voltage conversion modular circuit, a serial interface download program modular circuit, a clock modular circuit, a debugging modular circuit, a starting modular circuit and a CAN receiving and dispatching modular circuit. The signal generating circuit mainly comprises a stabilized voltage supply circuit, a square wave generating circuit, a sine wave generating circuit, a filter circuit and an amplifying circuit. The output circuit comprises a resonance detection circuit, a capacitance detection circuit and a voltage comparison circuit. The components and parts adopted by the circuit of the drainage pipe network liquid level measurement device are mature and reliable, low in cost and rich in source.