The invention discloses a falling and deformation preventing type negative-pressure profiling jig. The falling and deformation preventing type negative-pressure profiling jig comprises a jig seat, wherein the upper end of the jig seat is connected with a mobile phone shell profiling jig; a negative pressure area is formed in the front surface of the mobile phone shell profiling jig and positioned at a corresponding position on a battery bin; a plurality of negative pressure slots are formed at intervals in the negative pressure area. According to the falling and deformation preventing type negative-pressure profiling jig, the shapes of mobile phones are various, and the battery bins of all mobile phones are similar in shape and large in area, so that the mobile phone shell can be fixed through each battery bin area; in addition, air can be pumped out through a negative pressure port, and thus the mobile phone shell can be stably fixed to the mobile phone shell profiling jig through the negative pressure; negative pressure joint is arranged between two forks , so that the negative pressure joint can be prevented from being impacted while assembling and disassembling the mobile phone shell; with the adoption of the negative pressure slots, the air between the mobile phone shell and the mobile phone shell profiling jig can be pumped out to the maximum, so that the mobile phone shell can be firmly fixed. The falling and deformation preventing type negative-pressure profiling jig is applied to grinding of the mobile phone shell.