A structural assembly for electric scooter includes a seat mount and a treadboard support. The structural assembly utilizes hook portions on a connecting plate of the treadboard support to hook onto a stud shaft below a joining plate of the seat mount, and further utilizes embed pieces with compression springs disposed therein to be configured in the connecting plate to embed within fixing holes defined in the joining plate of the seat mount, and thereby complete rapid assemblage of the scooter. Furthermore, a triangular notch is defined in a push plate, and inclined sides of the triangular notch are so configured to function in coordination with inclined edges of wedge-shaped slots formed in upper portion of embed pieces, and thus control of extension or retraction of the embed pieces is effectuated by means of sliding coordination of the inclined sides and the inclined edges.