An optical fiber sensing layer that includes two layers of pressure-sensitive assembly films which are vertically superposed and at least one layer of flexible and smooth film that separates a space between the two layers of pressure-sensitive assembly film into at least two interlayers. Each interlayer is provided with at least one optical fiber row which has many S-shaped concatenated cablings and extends along a first direction. The cablings of the vertically adjacent optical fiber rows are staggered and superposed. The optical fiber rows are uniformly distributed on the pressure-sensitive assembly films to form optical fiber sensing areas, and the bending portions of the cablings of two vertically adjacent optical fiber rows are staggered and superposed.