Slurry flotation level measurement is a key link in the production of beneficiation, the accuracy and stability of the constant current source in the measurement system directly affect the quality of the final product. Aiming at the shortcomings of the existing constant current source circuit, such as low output accuracy, high frequency characteristics and poor load capacity, a new type of highprecision differential constant current source circuit is designed in this paper. By incorporating compensation capacitors at both ends of the feedback loop and load, the circuit′s highfrequency characteristics are optimized, reducing the phase shift of the output signal. Additionally, the load characteristics are enhanced using a floating access load. As a result, the circuit′s output impedance and load capacity are improved. The simulation and practical testing of the circuit demonstrate its effectiveness. Measurement results indicate that the newly designed constant current source achieves an adjustable range of 100 Hz to 50 kHz and a constant current of 0 to 20 mA within a 0 to 4 kΩ range. The circuit′s frequency and load characteristics show significant improvement, with maximum relative errors of 0513% and 0378%, respectively, meeting the high accuracy requirements for liquid level measurement in the pulp flotation industry.