The invention relates to a port warehousing logistics technology, in particular to a bulk material 
yard unmanned stacking / reclaiming technology. Firstly, a 
database is established; secondly, operation instructions, automatic stacking / reclaiming operation 
modes and control instructions for automatic stacking / reclaiming operations are generated through input operation kinds of goods and the planning work amount; thirdly, the relevant instructions are sent to a central control PLC and then transmitted to the corresponding local 
stacker / 
reclaimer PLC through the 
industrial network; fourthly, the local PLC controls the operation of all components of the 
stacker / 
reclaimer to complete the local operation control. At the same time, a material stack 
laser scanning device is used to scan the material 
yard condition, and the scanned result will then be transferred to a central control 
processing unit through the 
industrial network; fifthly, the central control 
processing unit achieves the stack type scan 
data processing of the 
stacker / 
reclaimer to generate new instructions which will then be sent to the corresponding local stacker / reclaimer PLC; sixthly, a 
handle operating panel arranged inside a central 
control room can be taken as a 
backup means of manual operation under special circumstances. The invention can be applied to large-scale 
raw material yards, such as ports, wharfs, open warehouses, mine stacking yards, as well as iron and steel enterprises.