The utility model discloses an ultrahigh-frequency sensor and a detecting device. The ultrahigh-frequency sensor comprises an insulating supporting piece; an antenna which is disposed on the insulating supporting piece, and the surface of the antenna is in the shape of a curved surface ; and a short-circuit pin which is connected to the antenna. According to the technical scheme of the utility model, the antenna of the ultrahigh-frequency sensor employs the structure in the shape of a curved surface, thereby increasing the direction and area of receiving, and improving the omnidirectivity of the ultrahigh-frequency sensor. The performance adjustment is carried out through the short-circuit pin, thereby expanding the working band of the sensor, and enabling the working band of the ultrahigh-frequency sensor to be wide. The ultrahigh-frequency sensor is excellent in performance and can meet the requirement of the spatial orientation of a transformer station.