The invention provides a building window and door shading performance detection device comprising a control device which comprises a first judgment module, a second control module, a third control module, a second detection module, a computation module, a determination module and a fourth control module. The computation module is used for computing the heat gain entering a metering box according to the air temperature A1 in the metering box, the air temperature A2 in the metering box, the second preset time and the average heating power I of a second heater. The determination module determinesthe preset water temperature and the preset water flow interval corresponding to the heat gain. The fourth control module is used for controlling turn-off of the second heater and controlling a cooling water box to operate according to the preset water temperature corresponding to the heat gain and controlling a water pump to operate within the preset water flow interval according to the air temperature of the metering box and the preset temperature. According to the detection device, the accuracy of the detection data can be ensured and the detection time can be effectively reduced, and thedetection efficiency can be enhanced.