The present invention provides a hatchback-type car tent device that is easy to store by installing a storage box in the trunk portion of the vehicle, as well as easy to install and dismantle, and to store and install a device for floor expansion together. The hatchback-type car tent device of the present invention includes a rectangular storage box disposed and installed in the trunk space of a car, and a tent membrane installed to cover the upper surface, both sides and rear of the hatchback in a state in which the hatchback is opened and lifted; A plurality of support members formed in a “L” shape are installed with one end hanging over one side of the storage box, and are installed on the upper surface of the support member to spread the floor inside the tent membrane and in the trunk space of the car. It includes a mat member for forming a surface.
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