Building structure cross node fire resistance test device and working method thereof

The invention provides a building structure cross node fire resistance test device and a working method thereof. The device is specially used for fire resistance test of building cross nodes. The device comprises a test furnace system, a loading system and a hydraulic system. The test furnace system comprises a test furnace, wherein the test furnace comprises a furnace body, a burner and a furnace cover; the loading system comprises a loading beam device, a column loading device, a loading frame, a beam end restraint device, a beam loading device and a base device; the loading beam device comprises a loading beam; the column loading device comprises a column loading oil cylinder base, a column loading hydraulic cylinder, a column loading hydraulic cylinder connector, a test piece column top connector, a horizontal pull rod base and a horizontal pull rod; the beam end restraint device comprises a beam end restraint hydraulic cylinder base, a beam end restraint hydraulic cylinder, a beam end restraint hydraulic