The present disclosure relates to the technical field of lamps, and discloses an outdoor decorative lamp, including a lamp holder and a lampshade connected to the lamp holder, and further including a lampwick component and a decorative shell, an annular connecting port is arranged at a top of the accommodating cavity; and the lamp holder extends out of the accommodating cavity through the annular connecting port. In the present invention, a traditional integrated barn lantern lamp is transformed into a replaceable barn lantern lamp bulb by assembling and combining a lamp bulb with the decorative shell. Lamps on a barn lantern string can be replaced at any time, which significantly reduces the usage cost.