The invention provides a cushioning device of an electric tricycle. The cushioning device comprises a buffer seat arranged on a tricycle frame, a rear wheel frame arranged on the rear side of the tricycle frame in a connected mode, a rear wheel rocker arm arranged below the rear wheel frame, and a buffer assembly arranged between the rear wheel frame and the rear wheel rocker arm in a connected mode; the buffer seat comprises four buffer column parts arranged on the tricycle frame, and a seat cushion arranged at the top ends of all the buffer column parts, and each buffer column part comprisesa cylinder, a stop ring, a guiding column, a spring and a clamping ring, wherein the cylinder is arranged on the tricycle frame in a supported mode, the stop ring extends outwards from the peripheraledge of the top end of the cylinder, the bottom end of the guiding column is arranged in the cylinder in an extending mode, the spring is arranged on the guiding column in a sleeving mode, and the clamping ring extends outwards from the top end of the guiding column and abuts against the top end of the spring; and the top ends of the guiding columns and the bottom end of the seat cushion are fixed. According to the cushioning device of the electric tricycle, the discomfort caused by vibration to a user is relieved through arrangement of the buffer seat, and vibration caused by the rear side is relieved through the buffer assembly.