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The present invention relates to a safe automatic transfer device of a cart for a ladder truck, controlling a cart to be automatically and safely lifted and stopped in a ladder truck. The present invention senses an absolute location value of rotation of a winch means lifting the cart to control lifting of the cart even if the safe automatic transfer device uses not an absolute type but an encoder in order to safely lift and stop the cart without damage to a data reel since installation of the data reel connected to a sensor for reducing and stopping the cart installed in an uppermost end of a boom support.COPYRIGHT KIPO 2016