The invention discloses an on-line intelligent detection type ferrograph analyzer and a detection method thereof. The method is characterized in that oil to be tested enters an ultrasonic oscillator through an oil inlet interface, an oil inlet flange, an oil delivery pipeline, a two-position two-way valve and an oil outlet pipe, and is mixed with tetrachloroethylene; after a substrate is pushed bya toothed bar push plate to a ferrogram making sleeve, a magnetic field is started; the mixed oil liquid flows through the substrate to finish ferrogram making; the toothed bar push plate pushes theferrogram to a camera platform to finish identification and storage of the ferrogram; then, tetrachloroethylene is injected to the ultrasonic oscillator and flows through the ferrogram making sleeve to finish cleaning; and control of execution and stop of all actions is realized by comparing the number of the placed substrates and the number of cycles. The on-line intelligent detection type ferrograph analyzer can effectively carry out online intelligent detection of ferrographic analysis, and has significant advantages in intelligent making and online detection of lubricating oil abrasive particle ferrogram, and operation condition evaluation of major equipment.