The invention relates to an efficient cleaning device used after fires, in particular to an efficient cleaning device used for fire protection after fires. The efficient cleaning device used for fire protection after fires is high in cleaning efficiency, small in repeat count, thorough in cleaning, and not prone to causing secondary fires. In order to solve the technical problems, the efficient cleaning device used for fire protection after fires comprises a first brush, a first rack, a second rack, a second brush, a left support, a first supporting rod, a first gear, a second gear, a lifting frame, a lifting cylinder body, a piston and the like. The left support, a first swing base and a guide plate are sequentially arranged on a trolley from left to right. The efficient cleaning device achieves the effects of being high in cleaning efficiency, small in repeat count, thorough in cleaning and not prone to causing secondary fires. Plenty of manpower and material resources are saved, the design is extremely humanized, the applied range is wide, and the efficient cleaning device can be accepted by people easily.