The invention provides an insulated mounting method for pitching prevention supports of an A-type independent liquid cargo tank. The pitching prevention supports comprise rib plates, mounting panels, stow-wood grooves and stow-woods. The insulated mounting mainly comprises: using foaming materials to protect each pitching prevention support, and preventing heat loss caused by heat transfer between metals. Main steps of the method comprise: surface cleaning for the liquid cargo tank and the pitching prevention supports, spraying of an anticorrosive coating, spraying of the foaming material, perfusion of the foaming material through die cavities, and spraying of a protective coating. Through the steps, the problem of inconvenience for insulated mounting of the pitching prevention supports can be effectively solved, and because the method is directed at a structure characteristic of the A-type independent liquid cargo tank and spraying of the foaming material and perfusion of the foaming material are adopted at the same time, the insulated effect can be effectively ensured, the tightness of insulated mounting can be guaranteed, and heat outside the liquid cargo tank is prevented from transferred into the liquid cargo tank.