The invention relates to a microwave radar moisture sensor, in particular to a contact/non-contact medium continuous or point sensing type microwave radar moisture sensor. The microwave radar moisture sensor comprises a probe, a signal channel, a signal processor (DSP), a TPS interface, a microprocessor (MCU), an I2C interface and a driving interface, wherein the output port of the probe is provided with an antenna, and the antenna can be provided with a holder and a filter scraper; the signal processor (DSP) and the microprocessor (MCU) are managed by respective software respectively; a pre-detected signal is connected with the driving interface through the probe, the signal channel, the signal processor, the TPS interface and the microprocessor (MCU); in addition, the probe, a polarization separator and a signal transceiver form a loop; and the antenna is arranged on one side or two sides of a detection medium. Because the microwave radar moisture sensor belongs to a multi-sensor system, correlated variables of the sensor are provided with enough interfaces, and other probes for temperature and electric conductivity can be connected with the signal processor through the I2C so as to finish moisture parameter correction.