Abstract: The present invention relates to the field of electric footsteps, and discloses a footstep telescoping mechanism and an electric footstep assembly. The footstep telescoping mechanism comprises main transmission arms, secondary transmission arms and lower swing arms, the main transmission arms, the secondary transmission arms, the lower swing arms and fixed seats form four-link hinge structures; and at least one of the three components of the main transmission arms, the secondary transmission arms and the lower swing arms is of the following structure, the structure comprises supporting frameworks Which are arranged at inner parts and used as reinforcing pieces, and body pieces which are formed on outer parts of the reinforcing pieces, the body pieces are made of non-metal materials, and the supporting frameworks and the body pieces are cast by a mold to form an integrated structure. The electric footstep has the advantages including light weight and good waterproofness.