The utility model relates to a meticulous filter equipment of borehole operation workover fluid uses in being particularly useful for oil -water well operation that hyposmosis, natural birth can hang down, and filter fineness improves by a wide margin, accords with the requirement of workover water, can reduce the oil reservoir and pollute, avoids the oil reservoir to block up, improves the operation effect. This device is including the level filtering bucket, be equipped with the sample valve on its staving, the sample valve is established on the staving of baffle below, the import pipe is established on staving upper portion, the outlet pipe is established and is passed from the base bottom the staving, be equipped with the filter core in the staving, filter core socket and baffle, set up the filter core socket on the baffle, the filter core is inserted in the filter core socket, the second grade filter vat communicates the valve with the level filtering bucket through bottom pipeline intercommunication and bottom being equipped with, the outlet pipe passes from the base in establishing the bottom pipeline between bottom intercommunication valve and second grade filter vat, be equipped with the upper portion staving intercommunication of series connection pipeline and second grade filter vat in the bottom pipeline between level filtering bucket and bottom intercommunication valve, the realization second grade filters.