The utility model discloses a liquid specific heat capacity measuring device, including liquid flow circulation module, liquid flow circulation module includes sample container, flow pump, calorimeter, cooler and expansion tank, sample container passes through the conveyer pipe and is connected with flow pump, flow pump passes through the conveyer pipe and is connected with the calorimeter, the calorimeter passes through the conveyer pipe and is connected with the cooler, the cooler passes through the conveyer pipe and is connected with the expansion tank, the expansion tank passes through the conveyer pipe and is connected with flow pump, set up the solenoid valve on the conveyer pipe between expansion tank and the flow pump. The beneficial effect of the utility model: the specific heat capacity of measurable quantity liquid under the high temperature condition, temperature measurement resolution ratio is high, and temperature control is accurate, furthest reduces heat dissipation, reduces measurement uncertainty, improve the accuracy nature of testing result, extend its application scope.