PET bottle preform wall thickness detection device

The utility model discloses a PET bottle preform wall thickness detection device, which comprises a base, a bottle preform clamping assembly is fixedly arranged on the base, a moving part is arranged on the base, a guide rod is fixedly mounted on the moving part, a lower sliding sleeve and an upper sliding sleeve are respectively arranged on the guide rod in a sliding manner, and the lower sliding sleeve and the upper sliding sleeve are fixedly connected with the base. A mounting groove is formed in the upper portion of the guide rod, the upper end of the guide rod is connected with a telescopic device, the telescopic device comprises a telescopic rod component and a first motor, the lower end of a first telescopic rod is connected with a baffle ring, the baffle ring comprises an outer edge ring, and the first telescopic rod is connected with the outer edge ring through a connecting rod. The inner diameter of the baffle ring is larger than or equal to the outer diameter of the guide rod, and the inner diamete