A detection system for improving accuracy of hematocrit measurement, comprising a central processing unit, an excitation source unit, a blood sample unit, a precise measurement circuit unit and a signal collecting unit; wherein the central processing unit is connected to an input end of the excitation source unit, an output end of the excitation source unit is connected to an input end of the blood sample unit, wherein an output end of the blood sample unit is connected to an input end of the precise measurement circuit unit, wherein an output end of the precise measurement circuit unit is connected to the signal collecting unit, and wherein the central processing unit is connected to the signal collecting unit; wherein the central processing unit is configured to output an instruction to the excitation source unit; and the excitation source unit is configured to generate a standard sine wave according to the instruction; wherein the blood sample unit is configured to collect a blood sample impedance signal indicating a blood impedance; wherein the precise measurement circuit unit is configured to receive the blood sample impedance signal from the blood sample unit and complete amplification of the blood sample impedance signal and conversion of the blood sample impedance signal to an effective value after the amplification, to thus provide a signal indicating the effective value of the blood impedance; wherein the signal collecting unit is configured to receive the signal indicating the effective value of the blood impedance from the precise measurement circuit unit and complete single-ended to differential amplification and analog-digital conversion of the signal indicating the effective value of the blood impedance, to thus provide a processed data indicating the effective value of the blood impedance, and the signal collecting unit is configured to output the processed data indicating the effective value of the blood impedance to the central processing unit; and wherein the central processing unit is further configured to calculate a blood impedance value according to the processed data indicating the effective value of the blood impedance and to output a control command to the signal collecting unit; wherein the excitation source unit comprises a waveform generator circuit and a waveform converter circuit connected to the waveform generator circuit wherein the waveform generator circuit is configured to generate the standard sine wave and the waveform converter circuit is configured to isolate a DC component of a signal output from the waveform generator circuit and convert a positive sine signal into a positive and a negative half-cycle sine waves; characterized in that the waveform generator circuit comprises a monolithic function generator configured to generate the standard sine wave; wherein the waveform generator circuit further comprises a crystal oscillator unit and a precise voltage reference unit, the precise voltage reference unit being connected to a voltage reference interface of the monolithic function generator and configured to provide a precise voltage reference for the monolithic function generator, the monolithic function generator being connected to the crystal oscillator unit, the crystal oscillator unit being configured to provide a high-precision clock signal; and the input end of the waveform converter circuit is connected to the output end of the monolithic function generator, and configured to isolate the DC component of a signal output from the monolithic function generator and convert the positive sine signal into the positive and negative half-cycle sine wave.