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The invention provides a fruit juice unfreezing device, and relates to the technical field of fruit juice production devices, the fruit juice unfreezing device comprises a rack, the rack is sequentially provided with a pre-unfreezing mechanism, an ice crushing mechanism and a heating mechanism from top to bottom; the pre-unfreezing mechanism comprises an unfreezing box, one side of the unfreezing box is provided with an opening and a movable blocking cover, an unfreezing frame is slidably arranged in the unfreezing box, an air inlet part is arranged at the top of the unfreezing box and externally connected with an air source, and an air outlet part is arranged at the bottom of the unfreezing box; the ice crushing mechanism comprises an ice crushing box, an ice crushing roller is rotationally arranged in the ice crushing box, and a first motor is fixedly arranged on one side of the ice crushing box; the heating mechanism comprises a heating tank, a heating jacket is fixedly arranged outside the heating tank and communicated with a water inlet pipe and a water outlet pipe, the water inlet pipe is externally connected with a hot water source, a stirring rod is rotationally arranged in the heating tank, and a second motor capable of driving the stirring rod to rotate is arranged at the top of the heating tank; the problems that an existing device is poor in unfreezing uniformity, and the flavor and quality of final products are affected are solved.