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The application discloses a dielectric constant microwave sensor with a microstrip coupling line structure and particularly relates to the technical field of microwave sensing, and comprises a metal transmission line on an upper layer, a dielectric substrate on a middle layer and a grounded metal plate on a bottom layer; a signal path of the upper layer structure of the microwave sensor is arranged between the first port and the second port, and the signal path is composed of at least one transmission line, four coupling lines and two metalized through holes. The microstrip coupling line structure adopted in the application is sensitive to changes in the dielectric constant of external materials, has the advantages of small size, easy processing, low cost, high precision and the like, different sizes of the microstrip coupling line provide two measurement working frequency bands, and the microwave sensor can be effectively applied to solid dielectric constant measurement work.