Device for determining water content of concrete

The utility model discloses a device for determining the water content of concrete, and the device comprises a phase-locked amplifier, a signal generator, a standard resistance box and a platinum wire probe, wherein the platinum wire probe is connected with the signal generator, the signal generator is connected with the phase-locked amplifier, the phase-locked amplifier is connected with the standard resistance box, and the standard resistance box is connected with the platinum wire probe again so as to form a loop; the platinum wire probe is also connected with the phase-locked amplifier. The device for determining the water content of concrete disclosed by the utility model is implemented by using a harmonic detection technology based a 3omega method; the device is sensitive to weak signal detection, relatively sensitive to water content, and high in measurement precision. The platinum wire probe of the device is long in service life, can be used repeatedly, uneasy to damage and good in insulation, simulta