The invention discloses a method for measuring elastic modulus of granular sludge. A solid model of granular sludge is established by using ANSYS software, data measured by an apparatus is combined, and the elastic modulus of granular sludge is obtained by automatic analysis and solution of the software. The method can be used for conveniently and rapidly determining elastic modulus of the granular sludge, analyzing stress conditions, providing a basis for establishing a responding mechanism between operation essential factors and stability of granular structures, and providing a concrete and optimal selection scheme for cultivating stable granular sludge.