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This utility model relates to the technical field of testing devices, and particularly to a device for measuring the inner and outer diameters of automotive engine pulleys. It includes a worktable, a first pneumatic measuring head mounted on the worktable for placing the pulley and measuring its inner diameter, and a second pneumatic measuring head slidably connected to the worktable for measuring the pulley's outer diameter. This testing device can accurately detect the inner and outer diameters of pulleys, and has high testing efficiency.