The invention relates to a device for manufacturing a continuous fiber reinforced thermoplastic prepreg tape. The device comprises a creel, a yarn guide roll, a fiber splitting device, a pre-heating oven, a melting, spinning and coating device, a heating device, a hot compression roll set, cold compression rolls and a wind-up roll which are sequentially arranged; the melting, spinning and coating device and the hot compression roll set are simultaneously heated by the heating device; the melting, spinning and coating device comprises a screw extruder, a numerical-control sliding table, a spinning assembly, a spinneret plate, bonding rolls and a collecting device; the screw extruder, the bonding rolls and the collecting device are arranged from top to bottom; and the spinneret plate and the bonding rolls are separately positioned in rear and front of a moving direction of a one-way continuous reinforced fiber band; the spinneret plate is parallel to the one-way continuous reinforced fiber band; and the collecting device is positioned below the spinneret plate. The device realizes one-step forming of melting, spinning and coating and prepreg preparing, so that process steps are simplified and efficiency is improved; and the manufactured continuous fiber reinforced thermoplastic prepreg tape is uniform in distribution, is stable in dimension and is low in porosity.