The invention discloses a high/low-pressure conversion valve. The high/low-pressure conversion valve comprises a valve body; a rotating shaft is arranged in the valve body, and is a hollow structure; and a rotary driving device for driving the rotating shaft to forwards rotate or reversely rotate is arranged at the upper part of the rotating shaft. The high/low-pressure conversion valve is characterized in that a first material inlet and a first material outlet are formed in the middle position of the rotating shaft; a second material inlet and a second material outlet are respectively formed in the middle part of the valve body; a first sealing plate and a second sealing plate are arranged at the upper ends of the first material inlet and the first material outlet; the first sealing plate is positioned at the upper end of the second sealing plate; a third sealing plate is arranged at the lower ends of the first material inlet and the first material outlet; and the first sealing plate, the second sealing plate and the third sealing plate are all arranged in the rotating shaft. The high/low-pressure conversion valve further comprises an oil quantity indicating device communicated with the rotating shaft. The high/low-pressure conversion valve can timely judge if the sealing is leaked, is convenient to maintain, is simple in structural design, and is suitable for large-scale popularization and application.