To provide an oil purification apparatus for waste cooking oil, with which impurities are effectively removed from a waste cooking oil and the waste cooking oil is purified into a substitute fuel oil for diesel engine in spite of being a simple and inexpensive apparatus constitution.

The oil purifying apparatus for waste cooking oil has a constitution that when a waste cooking oil mixed with an adsorbent is fed to the heating and stirring tank 3 of a heating and stirring apparatus 1, a heater 8 and a stirrer 7 attached to the heating and stirring tank 3 stir the waste cooking oil and the adsorbent while heating to adsorb impurities contained in the waste cooking oil on the adsorbent. Then the waste cooking oil containing the adsorbent is passed through a coarse filtration filter 13F in a coarse filtration tank 13 and a microfiltration filter 15F in a microfiltration tank 15 constituting a filtration and purification apparatus 2 and the adsorbent and the impurities are filtered off from the waste cooking oil to purify a substitute fuel oil for diesel engine.

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