The invention relates to the polyester spinning drawing field, in particular to a polyester tow drawing oil bath. The polyester tow drawing oil bath comprises water distribution plates, a maintenance disassembly plate, tow flow dividing devices, a bath outer frame, an emergency draining device, a draining port, a heating mechanism and water inlet pipes, wherein the bath outer frame is a long groove with the upper face open, the number of the water distribution plates is two, the two water distribution plates are arranged on two sides of the bath outer frame, the number of the water inlet pipes is two, the two water inlet pipes are respectively connected onto portions of the bottom of the bath outer frame, on the outer sides of the water distribution plates, the emergency draining device is arranged in the middle of one side of the bath outer frame, two dipping rolls are arranged on portions of the bath outer frame, on the inner sides of the water distribution plates, the tow flow dividing devices are respectively arranged on the inner sides of the two dipping rolls, and the heating mechanism is arranged at the bottom of a portion of the bath outer frame, between the two water distribution plates, in a coiler shape. The polyester tow drawing oil bath can prevent tows from being boned together, facilitates following tow flow dividing, stacking and crimping, and further can reduce generation of waste yarn.