The optical fiber array collimator is a major component in optical fiber communication systems， and its development is gradually moving toward array and integration. The traditional method of constructing a fiber array collimator is based on single-fixed and graded index lenses. It has disadvantages， such as difficulties in integrating and expanding the number of array elements and a complex packaging process. In this paper， a method of fabricating a fiber array collimator based on a plano-convex microlens array is proposed. The method utilizes the advantages of easy arraying of optical microlenses and good uniformity of array element characteristics. The theories of Gaussian and matrix optics were applied to analyze and simulate the collimation characteristics and determine the relevant design parameters of the fiber array collimator. A fiber array collimator with an array pitch of 250 μm is fabricated in this study. The far-field divergence angle is the main performance parameter measured using the far-field spot method. The measurement uncertainty is analyzed and evaluated using the Monte Carlo method. The measured values of far-field divergence angles of each channel in the fiber array collimator are 0.69°， 0.67°， 0.71°， and 0.68°， respectively， and the measurement expansion uncertainty is 0.02°， which is within the design tolerance limit of （0.68±0.03）°. The optical fiber collimator has good collimation characteristics and can meet the requirements of miniaturization and integration in the field of optical communication.