The utility model relates to a liquid connection level micrometer which comprises a levelness measuring unit and connection pipes. The levelness measuring unit comprises a dial gauge frame, a micrometer caliper measure head, a cone measuring head and water storage tanks, wherein the dial gauge frame is placed at a position on an upper surface of an object to be measured, the position on the upper surface is to be measured and compared, the dial gauge frame fixes the micrometer caliper measure head through a rod end chuck, the cone measuring head is fixed at the lower end of the micrometer caliper measure head, the water storage tank is placed right under the cone measuring head, and lower portions of the water storage tanks of the levelness measuring unit are connected with each other through the connection pipes. The liquid connection level micrometer is simple and safe to operate, capable of meeting levelness measuring requirements of ultra-long distance, high in measurement accuracy, low in cost, high in practicability, and broad application prospect.