The invention relates to the technical field of mobile phone vibration devices, in particular to a piezoelectric linear vibration type mobile phone vibration motor and a mechanical vibration amplifying mechanism. The piezoelectric linear vibration type mobile phone vibration motor comprises a shell. The shell is internally provided with a vibration assembly and a linear module. The vibration assembly comprises an elastic membrane arranged in the shell, and a first piezoelectric patch and a second piezoelectric patch are installed on the two sides of the elastic membrane respectively. The first piezoelectric patch and the second piezoelectric patch can be machined into thin slice shapes and even thin films. By means of the reasonable design, the thickness of the vibration motor can be reduced to 2 mm or below, and the piezoelectric linear vibration type mobile phone vibration motor can meet the development tendency of miniaturization and ultrathinness of mobile phones. Due to the fact that the piezoelectric patches have high energy density, high power can be achieved with small sizes; reciprocating mechanical movement produced by the piezoelectric patches can be amplified through a mechanical vibration amplifying mechanism and then coupled to a mobile phone shell and other hard objects, and an intensive linear vibration effect can be produced.