Inner tube assembly of rope core drill bit

An inner tube assembly of a rope core drill bitis characterized in that a spearhead (10) can be clamped with a recovery hook of the rope core drill bit; an elastic clamp positioning mechanism (20) is connected with the spearhead, and is provided with a first clamping plate (22) and a second clamping plate (24) hinged to the first clamping plate; the first clamping plate and the second clamping plate can be clamped in an elastic clamp room of an outer tube assembly of the rope core drill bit; a valve body (50) is provided with a connecting end (52) which can be connected with the elastic clamp positioning mechanism, and a sealing end (54); a valve hole (42) which can allow slurry to pass through is formed in a valve seat (40); the sealing end can seal the valve hole. If the inner tube assembly is always in the drilling state or fishing state, the elastic clamp positioning mechanism can drive the valve body, so that the sealing end does not seal the valve hole; if the inner tube assembly is in the pumping state