The invention relates to a mini-type inversing manual arc welding machine. A control circuit board in the mini-type inversing manual arc welding machine is designed to comprise three parts including a power board, a power supply board and a control board; an arranged circuit of the power board mainly comprises a single-end normal-shock inversing circuit composed of a rectifier bridge, electrolytic capacitors, IGBTs, diodes, a main transformer, a current detection mutual inductor, output rectifier diodes and the like, radiators and part of components; the power supply board mainly comprises an electrifying buffer, a switch power supply and an IGBT driving circuit; the control board mainly comprises a PWM output characteristic control circuit, a non-load voltage limiting circuit, an overcurrent and overheat protection circuit and a long-time output short-circuit protection circuit. The three circuit boards are designed in order to not only take the size and the weight of the welding machine into account, but also take cost factors of transportation and after-sales maintenance into account, and advantages of being reasonable in design, convenient to maintain, stable and reliable are achieved.