The utility model relates to an in M the quality method calorimeter automatic verification device of bus interface, it is through first or the 2nd electric -magnetic flow meter detection flow rate, through standard water supply, the return water platinum resistance thermometer measuring calculation standard difference in temperature to calculating standard calorie value, reading the tired accumulated heat volume of calorimeter in the test time section, and carry out the comparison with standard calorie value, whether calculating the test error, to judge the calorimeter qualified, can also take notes the quality of water volume of measuring through the volume jar of weighing and come the calculation standard flow through setting for the corresponding logical quality of water volume and thevelocity of flow, the utilization standard supplies water, return water platinum resistance thermometer detects the calculation standard difference in temperature, calculates out standard calorie value according to heat formula to carry out the comparison with the tired accumulated heat magnitude of the calorimeter that reads, calculation error judges whether qualified the calorimeter is, the utility model discloses it is as an organic whole with quality method examination system fusion with the standard method verification system, can detect requirement and condition switching calibration method according to the difference, utilize the changeable current loop of reversing solenoid valve to can switch between standard meter method examination and the examination of quality method, improveexamination efficiency.