In view of the mine explosion-proof vehicle was started up in low temperature environment,the hydraulic oil temperature could not achieve the best use value for a long time,through analyzing the mine explosion-proof vehicle hydraulic oil cooling system,it was found the cooling system continuous working in the condition of low temperature was the main reason that the oil temperature could not increase in time.A kind of automatic temperature control system for hydraulic fluid was designed by which the oil was heated in low temperature case,while motor drove fan to radiate when the oil temperature reached the set value.Then the hydraulic oil temperature is kept in the best use scope,extending the service life of hydraulic components.