BELT BUCKLE ASSEMBLY AND WEIGHTLIFTING BELT

The present invention discloses a belt buckle assembly and a weightlifting belt, and belongs to the technical field of belts. The belt buckle assembly according to the present invention comprises a belt buckle base plate, a pin shaft member, a ratchet wheel and a handle ratchet which fit each other, and a swing handle housing, wherein the swing handle housing is rotatably mounted on the belt buckle base plate through the pin shaft member; the handle ratchet is rotatably supported and mounted on the swing handle housing; the ratchet wheel is provided with a center hole and is sleeved on the pin shaft member through the center hole; and the ratchet wheel is provided with an unlocking slot. The belt buckle assembly further comprises a ratchet wheel unlocking mechanism, wherein the ratchet wheel unlocking mechanism comprises an unlocking assembly, which can move axially or radially along the pin shaft member so as to be engaged into or disengaged from the unlocking slot; when the unlocking assembly is engaged into the unlocking slot of the ratchet wheel, the pin shaft member can rotate together with the ratchet wheel; and when the unlocking assembly is disengaged from the unlocking slot of the ratchet wheel, the pin shaft member can rotate individually. Through the radial movement of an unlocking member along the pin shaft member, the pin shaft member and the ratchet wheel can be locked or unlocked conveniently.