We study thermodynamics of black holes in dRGT massive gravity. The dRGT massive gravity is a modified gravity theory in which graviton mass is given to the Einstein gravity theory while Einstein gravity theory corresponds to the theory of massless graviton. The P-V criticality and phase transition of the black hole are investigated in detail by comparing the results with the van der Waals system. Being treated as a thermodynamical system, the cosmological constant-like term is treated as a dynamical pressure. The consequent conditions on the parameters in the dRGT massive gravity for having such phase transition are explored.