A waterproof casing having a high cooling efficiency, the casing comprising a main body (1), a first end cap (2), and a second end cap (3). The main body (1) is integrally formed by means of an aluminum drawing process. The first end cap (2) and second end cap (3) are sealingly connected to two ends of the main body (1), respectively. A cooling channel (4) is provided on an inner wall on at least one side of the main body (1). A ventilation device (11) is provided between the cooling channel (4) and an internal space of the main body (1), is used to draw an airflow from within the internal space of the main body (1) to the cooling channel (4), and drives the airflow to circulate between the cooling channel (4) and the internal space of the main body (1). Also provided is a stage lamp having the waterproof casing having a high cooling efficiency. The present invention enables the waterproof casing having a sealed structure to have a high cooling efficiency, thus providing waterproofness to a stage lamp without influencing an operation performance of the stage lamp.
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