Harmless thermal desorption treatment system and treatment method for oil sludge

The invention discloses a harmless thermal desorption treatment system and a treatment method for oil sludge. The treatment system comprises an oil sludge pretreatment system, a feeding system, a thermal desorption system, a high-temperature combustion system, a tail gas treatment system and a discharging system, wherein a discharging port of the oil sludge pretreatment system is connected with afeeding end of the feeding system; a discharging end of the feeding system is connected with a feeding port of the thermal desorption system, a flue gas outlet of the thermal desorption system is connected with a gas inlet of a high-temperature combustion chamber, a discharging port of the thermal desorption system is connected with the discharging system, a tail gas outlet of the high-temperaturecombustion chamber is connected with a tail gas treatment system, and tail gas is exhausted to the atmosphere through a chimney after being treated to reach the standard. The temperature is well controlled in thermal desorpti