Heat preservation device for large-volume heavy-load tank car

The invention relates to a heat preservation device for a tank car, in particular to a heat preservation device for a large-volume heavy-load tank car, and solves the problem that the laying thickness of a heat preservation layer is limited as the load and the volume of a tank body of an existing heat preservation tank car are increased. The heat preservation device for the large-volume heavy-load tank car comprises two end socket heat preservation shells, a plurality of annular heat preservation shells and two sets of sleeper beam heat preservation shells. The two end socket heat preservation shells are arranged on the outer surfaces of two end sockets of the tank car correspondingly. A plurality of annular heat preservation shells are arranged on the tank body of the tank car; the sleeper beam heat preservation shell is located between the annular heat preservation shell and the end socket heat preservation shell. The outer surface of the tank body is coated with an aerogel heat preservation coating to form