The utility model provides a novel compound donkey-hide gelatin extracting solution concentrating device which at least comprises a preheating system, an evaporation system and a condensing water system, wherein the preheating system comprises a stoste tank, a feeding pump and a preheater which are connected in sequence through pipelines; the stoste tank is used for storing compound donkey-hide gelatin to be treated; the feeding pump is used for conveying the compound donkey-hide gelatin into the preheater for preheating the compound donkey-hide gelatin. The device has the advantages that the energy is saved, the environment is protected, the operation cost is low, a small area is occupied, and the automaton degree is high.