The invention discloses a floor heating pipeline leakage detection device and a floor heating pipeline leakage detection method. The floor heating pipeline leakage detection device is connected with afloor heating system. The floor heating pipeline leakage detection device comprises a controller, a liquid inlet valve arranged on a liquid inlet manifold, a liquid outlet valve on a liquid outlet manifold, and a hydraulic measuring mechanism arranged between the liquid inlet valve and the liquid outlet valve; the hydraulic measuring mechanism consists of an elastic liquid storage ball bag and ahydraulic gauge; the liquid storage ball bag communicates with a pipeline of the floor heating system; the hydraulic gauge measures hydraulic pressure in the pipeline; the hydraulic gauge is connectedwith the controller; the controller acquires a hydraulic pressure-time curve output by the hydraulic gauge; and when the fluctuation of the hydraulic pressure-time curve reaches or exceeds a preset value, the controller gives a liquid leakage alarm and closes the liquid inlet valve. The floor heating pipeline leakage detection method comprises the steps that when the floor heating system is in aworking state, the liquid outlet valve is closed firstly and then the liquid inlet valve is closed; the controller obtains the hydraulic pressure-time curve; and when the hydraulic pressure fluctuation reaches or exceeds the maximum permissible error of the hydraulic gauge, the controller sends a liquid leakage alarm. The floor heating pipeline leakage detection device and the floor heating pipeline leakage detection method have the advantages that the detection precision is high, and leakage pressure which is 0.03 Mpa or more can be detected.