The present invention belongs to the technical field of flow calibration, and discloses a calibration device for a variable head
water flow standard device, including a pressure-stabilizing water
tower, the pressure-stabilizing water
tower is connected with a standard flow meter, a water pump, a water weighing device and a water tank, and a variable head
water flow standard device to be calibrated through a water direction regulating module, the water direction regulating module, the standard flow meter, the water weighing device, and the variable head
water flow standard device to be calibrated are all connected with a processor, and the processor controls the flow direction of
liquid water between the pressure-stabilizing water
tower, the standard flow meter, the water pump, the water weighing device and the water tank, and the variable head water flow standard device to be calibrated through the water direction regulating module, first completes the calculation of the instrument coefficient or flow correction value of the standard flow meter, and then completes the volume calculation of each volume section of the volume section water tower in the variable head water flow standard device to be calibrated, thereby realizing automatic calibration of the variable head water flow standard device to be calibrated. A calibration method for a variable head water flow standard device is also disclosed.