Threshold assembly structure and electric automobile

The invention provides a doorsill assembly structure. The doorsill assembly structure comprises a doorsill inner plate, a doorsill supporting plate and a doorsill outer plate. The threshold inner plate, the threshold supporting plate and the threshold outer plate are fixedly connected in sequence in the Y direction. Wherein the doorsill supporting plate is arranged in the Z direction, and after the doorsill assembly structure is assembled to a vehicle body, the doorsill inner plate is connected with the vehicle body and located on the floor face of the vehicle body, so that a mounting space is defined by the doorsill inner plate and the doorsill supporting plate. Therefore, the connecting part can be arranged in the mounting space, the arrangement space of the power battery is avoided, and an E-shaped sealing structure and a sealing strip are additionally arranged, so that a main seal and an auxiliary seal can be formed, the sealing of a passenger compartment is realized, and air leakage and water inflow of t