Liquid detecting instrument

The utility model relates to the field of liquid detection and discloses a liquid detecting instrument. The liquid detecting instrument comprises a power supply, a detecting antenna, a processor, a display screen and a shell, wherein the output end of the power supply is provided with two ends S1 and S2; the detecting antenna consists of an emission electrode E0 and three receiving electrodes E1, E2 and E3; the processor is provided with signal inputting points A0, A1, A2 and A3 corresponding to the emission electrode E0 and the three receiving electrodes E1, E2 and E3, and the receiving electrodes E1 and E2 are fixedly connected with the corresponding signal inputting points A1 and A2; the output end of the processor is connected with the display screen; the emission electrode E0 is communicated with the end S1 of the power supply or the signal inputting point A0 by virtue of one end of a linking switch, and the receiving electrode E3 is communicated with the signal inputting point A3 or the end S2 of the power supply by virtue of the other end of the linking switch. The liquid detecting instrument is capable of achieving safe and reliable detection effect with insufficient detection conditions.