PURPOSE: A device to expand a trunk loading space of vehicles is provided to drive a corresponding vehicle, a rear vehicle, or a neighboring vehicle by fixing a trunk cover even if many cargos compared to a load capacity are loaded. CONSTITUTION: A device (1) to expand a trunk loading space of vehicles comprises a trunk cover (10), a first panel member (20), a second panel member (30), and a driving member (40). A flexible packing is interposed in a connection groove (11). The upper ends of the first panel member and the second panel member are closely connected to the connection groove and form a loading space expanded inside the first and second panel members.
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