The invention discloses a novel tripod landing and releasing device, and relates to the technical field of seabed landing, releasing and recovery. A guide column is arranged at the top end of a bottomsupport system, and the guide column and a buoyancy recovery system are slidably arranged; when the other end of a retaining plate is matched with a stop plate, the stop plate and the guide column are clamped; a vibration spring sleeves the guide column, one end of the vibration spring abuts against a tensioning nut, and the other end abuts against the bottom support system; a sound transductionswitch is fixedly arranged below the buoyancy recovery system; a turnover plate is rotationally arranged at the bottom end of the buoyancy recovery system, one end of the turnover plate is matched with the sound transduction switch, and the other end of the turnover plate is provided with a hook groove; an anchor chain is suspended inside the hook groove in the turnover plate; the two ends of a rotating ring are sleeved with the anchor chain, and a protrusion is arranged on the rotating ring. The device has the advantages that impact borne when a valuable instrument lands at the seabed is lowered, it is ensured that the instrument can be in use normally during landing, the buoyancy recovery system can be released and recovered, and repeated use of the instrument is ensured.