The invention discloses a not-easily-deformed storage battery heat insulating cover. The not-easily-deformed storage battery heat insulating cover comprises a heat insulating cover body; the heat insulating cover body includes a box body, a box cover, a ventilation pipe, a ventilation box and a bolt, wherein the bolt is used for connecting the box cover and the box body; the ventilation box and the box body are connected via the ventilation pipe; a ventilation hole is formed in a sidewall of the box body; a lateral plate formed into the box body includes a heat insulating aluminum foil, an anti-deformation bracket, the box body provided with a coolant and a top cover; the heat insulating aluminum foil is attached to an outer sidewall of the top cover; the top cover is arranged on the box body provided with the coolant; the anti-deformation bracket is arranged in an inner cavity of the box body provided with the coolant; the anti-deformation bracket includes a steel rectangular frame and a bracket, wherein the bracket is arranged on the steel rectangular frame; and the bracket is of an X shape. The not-easily-deformed storage battery heat insulating cover has simple structure and good heat insulating effect, is not easily deformed, and is low in cost and easy for promotion.