The invention discloses a computer circuit board soldering machine. The computer circuit board soldering machine comprises an upper beam and supporting pillars fixed to the bottoms of two sides of theupper beam. A supporting frame is fixedly arranged between the supporting pillars under the upper beam. A first sliding groove is formed in the supporting frame. A first threaded rod extending left and right is arranged in the first sliding groove. A sliding block is connected with the first threaded rod in a threaded fit mode. The upper portion of the sliding block is located outside the surfaceof the supporting frame. A sliding cavity is formed in the sliding block. A concave groove is formed in the upper surface of the sliding block. A penetrating groove vertically penetrating through theinside of the sliding block is formed between the center of the bottom surface inside the concave groove and the center of the upper surface inside the sliding cavity. A second threaded rod extendingleft and right is arranged in the sliding cavity. An ejection block is arranged on the second threaded rod. A first bevel surface is arranged on the upper portion of the left side of the ejection block. The computer circuit board soldering machine is simple in structure, low in manufacturing cost and maintaining cost, and capable of automatically controlling lifting soldering work and automatic angle adjustment of a soldering gun.