The invention relates to a propelling device and method for a space maneuvering platform and belongs to the technical field of space propelling. The propelling method is a composite propelling methodwith chemical propelling and electric propelling combined. The propelling device for the space maneuvering platform is provided, and the new composite propelling method is formed by combining chemicalpropelling and electric propelling processes. The chemical propelling process is that a combustible gas working medium mixture is ionized and ignited under the effect of high-voltage pulses, a chemical combustion reaction is induced, a large amount of chemical energy is released, thus mixed gas expansion is accelerated, and forward thrust is provided for the device owing to resisting of a front end thrust wall; and the electric propelling process is that a plasma mixture generated by ionization and the chemical combustion reaction is accelerated backwards under the Lorentz force effect generated by the mutual effect of a large current and an induced magnetic field of the plasma mixture and is sprayed out through an exhaust nozzle to provide forward thrust for the whole device.