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The invention discloses a passive type vibration absorption boring bar and an optimal vibration absorption performance adjustment method thereof, belongs to the field of machining, and solves the problem that the steps for adjusting the existing intelligent vibration absorption boring bar are complicated. The boring bar is characterized in that a mass block, a telescopic type cantilever beam and a sliding block are arranged in the boring bar in sequence from front to back; two ends of the telescopic type cantilever beam are fixedly connected with the mass block and the sliding block respectively; the mass block and the overhang part of the telescopic type cantilever beam are located in a first cavity to form a variable-rigidity vibration absorber; the vibration absorber can do cantilever vibration in the first cavity; the sliding block can slide in the boring bar so as to change the overhang amount of the telescopic type cantilever beam; the sliding block is linked with a knob arranged at the rear end of the boring bar. The method comprises the following steps: calculating the equivalent rigidity of the vibration absorber when the amplitude of a bar body of the boring bar is zero; enabling the equivalent rigidity of the vibration absorber to be equal to the equivalent rigidity of the vibration absorber when the amplitude of the bar body of the boring bar is zero by adjusting the overhang amount through the knob. The passive type vibration absorption boring bar is applicable to deep hole boring machining.