Belonging to the technical field of oil sludge treatment, the invention specifically relates to a technological method for treatment of oil field oil sludge. The technological method consists of: solid oily sludge screening, solid oily sludge dry steam oil melting, solid oily sludge high-pressure water crushing, liquid oily sludge pretreatment, first level cleaning, second level cleaning, third level cleaning, fourth level cleaning, dehydration treatment and oil-water recovery. Specifically, an oil melting tank includes a box body, uniformly distributed ring cavity sieve columns and dry steam nozzles, the dry steam nozzles are located in the ring cavity sieve columns, the diameter of sieve pores on the inner and outer walls of the ring cavity sieve columns is 5mm, and the bottoms of the ring cavity sieve columns are provided with turnable discharge cover plates. A crushing box includes a shell, uniformly distributed material bins and high pressure water spray guns, the high pressure water spray guns are located at the top of the material bins, and both side walls of the material bins are provided with uniformly distributed round holes. The process involved in the invention has the advantages of reasonable design, safety and environmental protection, good treatment effect, high treatment efficiency, strong treatment capacity, and cost saving, and is economical and applicable.