The invention discloses a fireproof bridge-cutoff aluminum alloy casement window. The fireproof bridge-cutoff aluminum alloy casement window is characterized in that inward opening sashes, a glass fixing sash glass pressing strip, a window frame, a window beam, corner connectors, heat insulation and fire prevention glass, inflaming retarding sealing rubber strips, inflaming retarding weather strips, an unlocking device, glass fixing supports, outer frame reinforcing steel sheets, cavity steel bushes, sash reinforcing steel sheets, steel bush corner connecting sheets, stainless steel screws, glass periphery clearance parts, refractory glass cushion blocks, fireproof expansion strips, fireproof silver, cavity injection mud and fireproof sealant. The fireproof bridge-cutoff aluminum alloy casement window is high in overall strength and good in overall fire prevention and sound insulation effect, the overall heat conduction performance of a heat insulation bridge-cutoff aluminum alloy profile is lower than that of a common aluminum alloy profile, the fire prevention and heat insulation effect is better, the inflaming retarding sealing rubber strips and the inflaming retarding weather strips have the performance of fire prevention, inflaming retarding and water prevention, and the fireproof bridge-cutoff aluminum alloy casement window is suitable for being used and popularized on various buildings with high fireproof performance requirements.