A printing layer trimming method, suitable for an electronic device, the printing layer trimming method comprising: converting an original layer into a first printing layer (FPIY, FPIY1, FPIY2, FPIY3, FPIY4), wherein the original layer is one of a plurality of layers corresponding to a three-dimensional structure (step S120), the first printing layer (FPIY, FPIY1, FPIY2, FPIY3, FPIY4) includes a plurality of substantive printing points; the printing layer trimming method being characterized in further comprising: detecting the plurality of substantive printing points along a first direction of the first printing layer (FPIY, FPIY1, FPIY2, FPIY3, FPIY4) to identify a first starting point position (P1, P2, P3, P4, P5, P6) and a first end point position (T1, T2, T3, T4, T5, T6) of each of at least one data region (D1, D2, D3, D4, D5, D6) of the first printing layer (FPIY, FPIY1, FPIY2, FPIY3, FPIY4) in the first direction, wherein the first starting point position (P1, P2, P3, P4, P5, P6) is a position where the substantive printing points start to appear in the first direction, and there is no more substantive printing point after the first end point position (T1, T2, T3, T4, T5, T6) in the first direction; and identifying at least one blank region (B1, B2, B3, B4, B5, B6) without the substantive printing points in the first printing layer (FPIY, FPIY1, FPIY2, FPIY3, FPIY4) according to the first starting point position (P1, P2, P3, P4, P5, P6) and the first end point position (T1, T2, T3, T4, T5, T6) of each of the at least one data region (D1, D2, D3, D4, D5, D6), comprising: identifying one or more first regions outside each of the data region (D1, D2, D3, D4, D5, D6) in the first layer (FPIY, FPIY1, FPIY2, FPIY3, FPIY4) as the blank region(B1, B2, B3, B4, B5, B6); and determining whether there is a second region without substantive printing points in an area between the first starting point position and the first end point position in the first direction by detecting the plurality of substantive printing points, and taking the second region without substantive printing points as the blank region; and trimming off the at least one blank region (B1, B2, B3, B4, B5, B6) of the first printing layer (FPIY, FPIY1, FPIY2, FPIY3, FPIY4) (step S160). detecting the plurality of substantive printing points along a first direction of the first printing layer (FPIY, FPIY1, FPIY2, FPIY3, FPIY4) to identify a first starting point position (P1, P2, P3, P4, P5, P6) and a first end point position (T1, T2, T3, T4, T5, T6) of each of at least one data region (D1, D2, D3, D4, D5, D6) of the first printing layer (FPIY, FPIY1, FPIY2, FPIY3, FPIY4) in the first direction, wherein the first starting point position (P1, P2, P3, P4, P5, P6) is a position where the substantive printing points start to appear in the first direction, and there is no more substantive printing point after the first end point position (T1, T2, T3, T4, T5, T6) in the first direction; and identifying at least one blank region (B1, B2, B3, B4, B5, B6) without the substantive printing points in the first printing layer (FPIY, FPIY1, FPIY2, FPIY3, FPIY4) according to the first starting point position (P1, P2, P3, P4, P5, P6) and the first end point position (T1, T2, T3, T4, T5, T6) of each of the at least one data region (D1, D2, D3, D4, D5, D6), comprising: identifying one or more first regions outside each of the data region (D1, D2, D3, D4, D5, D6) in the first layer (FPIY, FPIY1, FPIY2, FPIY3, FPIY4) as the blank region(B1, B2, B3, B4, B5, B6); and determining whether there is a second region without substantive printing points in an area between the first starting point position and the first end point position in the first direction by detecting the plurality of substantive printing points, and taking the second region without substantive printing points as the blank region; and identifying one or more first regions outside each of the data region (D1, D2, D3, D4, D5, D6) in the first layer (FPIY, FPIY1, FPIY2, FPIY3, FPIY4) as the blank region(B1, B2, B3, B4, B5, B6); and determining whether there is a second region without substantive printing points in an area between the first starting point position and the first end point position in the first direction by detecting the plurality of substantive printing points, and taking the second region without substantive printing points as the blank region; and trimming off the at least one blank region (B1, B2, B3, B4, B5, B6) of the first printing layer (FPIY, FPIY1, FPIY2, FPIY3, FPIY4) (step S160).