To provide a silent hub ratchet structure of normally closed type, which prevents a pedal of a bicycle from rolling simultaneously when pushing and moving the bicycle, moves the bicycle silently, and achieves excellent performance in practical use.

This silent hub ratchet structure of normally closed type is constituted in such a way that a plurality of control blocks protrude on an end face, each of the control blocks includes a tooth disc seat, a ratchet seat, a ratchet, and an elastic member which are recessed to form an interlocking groove. A plurality of ratchet grooves are formed on the exterior wall surface of the ratchet seat, the ratchets are provided in the ratchet grooves, interlocking columns installed in the ratchets are slidably installed in the interlocking groove, and a tightening ring groove is provided like a ring to surround a via-hole on the exterior wall surface of the ratchet seat and an outer surface of the ratchet. This silent hub ratchet structure includes a ratchet member allowing the elastic member to be fitted and provided in the tightening ring groove, a retaining ring forming a positioning groove and letting the positioning groove mesh with a positioning block in the ratchet seat synchronously, and a hub-casing allowing a bevel ring to be locked in an interior wall and provided at the outer end of the ratchet like a ring.