Calibration device of fluid meter

The utility model discloses a calibration device of a fluid meter, comprising a calibration unit which comprises a base and a liquid storage tank fixedly connected on the base, the upper side wall of the liquid storage tank is fixedly connected with a fixed table, and the fixed table is fixedly connected with a collection box; the fixing unit comprises a first clamping block fixedly connected to the fixing table and a second clamping block slidably connected to the fixing table, a threaded rod in threaded connection is arranged on the fixing lug in a penetrating mode, and one end of the threaded rod is rotationally connected to the side wall of the second clamping block; semicircular trays are fixedly connected to the side walls, close to each other, of the first clamping block and the second clamping block correspondingly, and one end of each semicircular tray is rotationally connected with a corresponding semicircular chuck. According to the utility model, the first clamping block and the second clamping bl