Double chassis of self-propelled platform to perform work at height comprising a main chassis (6), on which the frame (2) is arranged, which comprises at least two stringers (7) and at least two crossbars (8) joined together in solidarity, and at least one ear (9) that starts from each crossbar (7) and each crossbar (8) in a downward vertical direction. It also comprises a secondary chassis (10), linked to the wheels (1), and which is connected to the main chassis (6) by free ends of the ears (9) with respect to which it swings, and said secondary chassis (10) It comprises two secondary stringers (11) and two crossbars (12) joined together with connecting elements that allow relative rotation between the secondary stringers (11) and the secondary crossbars (12).Chasis doble de plataforma autopropulsada para realizar trabajos en altura que comprende un chasis principal (6), sobre el que se dispone el bastidor (2), que comprende al menos dos largueros (7) y al menos dos travesaños (8) unidos entre sí de forma solidaria, y al menos una oreja (9) que parte de cada larguero (7) y cada travesaño (8) en dirección vertical hacia abajo. Asimismo comprende un chasis secundario (10), vinculado a las ruedas (1), y que está unido al chasis principal (6) por unas extremidades libres de las orejas (9) respecto a las cuales bascula, y dicho chasis secundario (10) comprende dos largueros secundarios (11) y dos travesaños (12) unidos entre sí con unos elementos de unión que permiten el giro relativo entre los largueros secundarios (11) y los travesaños secundarios (12).
