Abstract: A moisture and contaminant separator for compressed air includes: an outer cylinder having an upper mist accumulator and a lower water collector; and an inner cylinder secured in a central portion of the outer cylinder having an impinging condenser formed in the inner cylinder provided with a plurality of leftward and rightward oriented air passages in the impinging condenser to allow the crossing impact, impinging, mixing, settling and condensation of water mist or contaminant particles laden in the compressed air stream into the separator to be dropped and collected in the lower water collector of the outer cylinder; upon the primary removal of water and contaminants from the compressed air stream, the mist still carried on the air stream will be accumulated on the inside wall of the upper mist accumulator and then drained into the lower collector for further removal of the mist and contaminants laden in the air; and the demisted dry air will be delivered outwardly through an upper port.