The invention discloses an offshore oil platform temperature control system, which comprises a compressor, a condenser, a liquid storage tank, an expansion valve and an evaporator, wherein the compressor, the condenser, the liquid storage tank, the expansion valve and the evaporator are circularly connected, the sides of the condenser and the evaporator are respectively provided with a fan, an air outlet of the compressor and an inlet of the liquid storage tank are connected by a one-way valve, and a liquid outlet of the condenser is provided with a condensing pressure regulator. The offshore oil platform temperature control system has the advantages that the structure is simple, the convenience in use is realized, the working temperature range is -17 DEG C to 38 DEG C, the control precision of the room temperature can reach +/-1 DEG C, the good anti-explosive class is realized, the ExdIIBT4 anti-explosive class is realized, the safety hazards to the oil platform are avoided when the oil platform leaks, the evaporator can be normally used and cannot be frosted, and the normal use of the temperature control system is ensured.