The invention discloses an anticorrosion top pipe. The anticorrosion top pipe comprises an anticorrosion layer, a steel cylinder, a concrete layer, a steel cylinder and an anticorrosion layer which are arranged sequentially from inside to outside. The anticorrosion layer comprises, by weight, 10 parts to 15 parts of epoxy resin, 15 parts to 17 parts of polyurethane, 20 parts to 23 parts of coal tar, 2 pars of a curing agent, 2 parts of a defoaming agent, 3 parts to 4 parts of an antibacterial agent and 4 parts to 5 parts of reactive diluent. The problem that a top pipe made of existing common concrete is poor in corrosion resistance and short in service life is solved.