The invention discloses a combined step milling method of a strip mine semi-continuous
system. The combined step milling method comprises the following steps that a, a first excavation belt for mining a main mining step is taken as an
initial point to mine a first width of the main mining step in the direction of a
machine head; b, multiple width mining operations of the main mining step are completed, and a working surface conveying
machine is moved; c, movement of the main mining step is completed and excavation of the multiple mining widths is completed, the semi-continuous
system is shifted into the first with mining of the next step, and after mining is completed, an
excavator continues to carry out notch forming on the next width of the next step, and the next width is excavated; and d, after multiple width mining operations of the next step are completed, the working surface conveying
machine is moved. The combined step operation is adopted in the combined step milling method, the exploitable yield of the semi-continuous
system within a one-time movement period is effectively increased, the one-time movement service period of the system is prolonged, and therefore the production efficiency of the system is improved.