The invention discloses an eight-mouth PLC (Programmable Logic Controller) automatic-control rotary cement packaging machine. A rotary shaft (24) is installed on a base (20) through a bearing, the upper part of the rotary shaft (24) is installed provided with a main barrel (29), the bottom of the main barrel (29) is uniformly distributed with eight valves (36) are uniformly distributed on the bottom of the main barrel (29) and connected with a valve controller (8), a crossbeam (2) is installed above the main barrel (29) through a support, a steady-flow and constant-weight feeder (1), a carbon-brush small slide ring (3), a carbon-brush large slide ring (4), a speed reducer (5) and a rotary speed changing box (6) are installed on the crossbeam (2), the rotary shaft (24) is connected with the speed reducer (5) through the rotary speed changing box (6), a magnetic door (28) is arranged on a barrel cover (30) of the main barrel (29), and a discharge port of the steady-flow and constant-weight feeder (1) passes through the magnetic door (28) of the main barrel (29). The packaging machine has the advantages of automatic control, positioning of multi-valve packaging, accurate metering, less error, environmental protection, low labor intensity and high working efficiency.