A link-lever assembly, comprising a dual-joint link-lever and a guiding rod, wherein the guiding rod comprises a ring portion and a rod portion; the dual-joint link-lever comprises a first connection ring, a first pressing panel, a second connection ring, a second pressing panel and a connection plate; the first connection ring and the second connection ring are provided at both ends along a longitudinal direction of the connection plate, and the first connection ring and the second connection ring are axially parallel; the first pressing panel is provided at a side of the connection plate in a thickness direction and an end portion of the first pressing panel is connected with the first connection ring, a first locking joint (c) communicating with a first annular hole (a) of the first connection ring is formed in between the first pressing panel and the connection plate; the second pressing panel is provided at another side of the connection plate in the thickness direction, and an end portion of the second pressing panel away from the first pressing panel is connected with the second connection ring, and a second locking joint (d) communicating with a second annular hole (b) of the second connection ring is provided in between the second pressing panel and the connection plate; the first pressing panel and the second pressing panel are configured to reduce the diameters of the first annular hole (a) and the second annular hole (b) by pressing forces acting in opposite directions; at least one connection hole (g) is provided on the ring portion, a third locking joint (h) extending along an axial direction of the rod portion is provided on the rod portion, and the third locking joint (h) is communicated with the at least one connection hole (g); the rod portion is inserted into the second connection ring; the rod portion is configured to reduce the size of the third locking joint (h) when being pressed and thereby reduces the diameter of the at least one connection hole (g) of the ring portion. the dual-joint link-lever comprises a first connection ring, a first pressing panel, a second connection ring, a second pressing panel and a connection plate; the first connection ring and the second connection ring are provided at both ends along a longitudinal direction of the connection plate, and the first connection ring and the second connection ring are axially parallel; the first pressing panel is provided at a side of the connection plate in a thickness direction and an end portion of the first pressing panel is connected with the first connection ring, a first locking joint (c) communicating with a first annular hole (a) of the first connection ring is formed in between the first pressing panel and the connection plate; the second pressing panel is provided at another side of the connection plate in the thickness direction, and an end portion of the second pressing panel away from the first pressing panel is connected with the second connection ring, and a second locking joint (d) communicating with a second annular hole (b) of the second connection ring is provided in between the second pressing panel and the connection plate; the first pressing panel and the second pressing panel are configured to reduce the diameters of the first annular hole (a) and the second annular hole (b) by pressing forces acting in opposite directions; at least one connection hole (g) is provided on the ring portion, a third locking joint (h) extending along an axial direction of the rod portion is provided on the rod portion, and the third locking joint (h) is communicated with the at least one connection hole (g); the rod portion is inserted into the second connection ring; the rod portion is configured to reduce the size of the third locking joint (h) when being pressed and thereby reduces the diameter of the at least one connection hole (g) of the ring portion.