The invention provides a piling machine hammer. The piling machine hammer is characterized in that the hammer is designed to a structural form of a piston cylinder, an external energy accumulator communicates with a piston cavity of the piston cylinder through a corresponding pipeline, the largest hitting power can be effectively controlled on the basis of guaranteeing hitting energy not to be changed, hitting bounce is reduced, hammering time is prolonged, penetration of piling is improved, and a concrete prefabricated pile head can be effectively protected.