The utility model discloses a sample temperature control device for a deck simulation corrosion test on a cargo oil tank. The sample temperature control device comprises a multifunctional reaction kettle cover and a water temperature control circulation device (1), wherein the multifunctional reaction kettle cover consists of a kettle cover base (4), a kettle cover water pipe (5), sample mounting tanks (8) and sample temperature measuring probes (9); multiple sample mounting tanks (8) are arranged on a bottom surface of the kettle cover base (4) and are used for mounting the samples and sample temperature measuring probes (9); the kettle cover water pipe (5) for delivering circulating water is arranged on the top of the kettle cover base (4); the water temperature control circulation device (1) is connected with the kettle cover water pipe (5); the sample temperature measuring probes (9) are connected with the water temperature control circulation device (1) and control the temperature of the circulating water. The sample temperature control device has the advantages that the temperature control mode is a top cover heat transfer temperature control mode, the temperature control characteristic of the deck on the cargo oil tank in a service environment is met, and the sample temperature control device has the characteristic of sensitive temperature control, so that the result of the corrosion test is accurate.