A device for automatically adjusting the staking pressure in staking machines with beating plates, wherein the machine includes at least one fixed plate (5) and at least one moving plate (4) which face each other and are provided with complementarily shaped tools; the fixed plate (5) is installed on threaded posts (11) which can be screwed in complementarily threaded bushes (12) which are rigidly coupled to a bed (3); there are locking devices (13) which act selectively on the fixed plate (5). The device includes at least one servomechanism (16) which is rigidly coupled to the fixed plate (5) and is connected to the threaded posts (11) for their automatic rotation; sensor devices (23) for detecting the value of the maximum penetration of the tools and for generating a first electrical signal; electronic control devices (24) for comparing the first electrical signal with a second presettable electrical signal which corresponds to the intended staking pressure and for continuously adjusting the power supply of the servomechanism. The servomechanism (16) consists of a gearmotor which is connected to the threaded posts (11) by virtue of a toothed belt and a chain.