Provided is a pressure tank (10) having a lattice structure, including: a tank body (50) that has a high-pressure fluid accommodated therein and is manufactured to have a prismatic shape; and cell structures (1000) that are disposed in the prismatic tank body (50), are manufactured in a lattice form, arrive from one side wall of the tank body (50) to the other side wall thereof facing it, and are orthogonally arranged regularly.