The invention discloses a waterproof heat insulation roof with a detachable cleaning piece. The waterproof heat insulation roof comprises a first heat insulation layer fixed to the upper portion of ta steel structure; a second heat insulation layer is fixedly arranged above the first heat insulation layer; a flexible waterproof layer is sprayed to the bottom face of the second heat insulation layer, a rigid waterproof layer is fixedly arranged on the top face of the second heat insulation layer; an interval cavity is formed between the first heat insulation layer and the second heat insulation layer; a purlin hanger structure fixed to the steel structure penetrates through the roof to be fixedly connected with a fixing supporting rod; the fixing supporting rod is provided with a fixing sleeve, and a safety rope fixing piece is detachably connected to the fixing sleeve. Due to the two waterproof layers and the two heat insulation layers, the waterproof and heat insulation functions of a building are ensured; by arranging the cavity, the heat insulation and sound insulation functions of the building are added; by arranging the external rigid waterproof layer and the internal flexible waterproof layer, the two waterproof layers are matched, the better waterproof effect is achieved; due to a detachable supporting point, and the beautifying effect is not affected while the roof is easy to clean.