The invention discloses a loader boom cylinder buffer valve and a control system thereof. The operation system of the loader boom cylinder buffer valve comprises a boom cylinder and a reversing valve, wherein the boom cylinder and the reversing valve form a hydraulic loop for controlling the boom cylinder to move; an oil path between a large cavity of the boom cylinder and the reversing valve is provided with a buffer valve; the buffer valve comprises a valve body and a valve element component; the valve element component is arranged in the valve body; the valve body comprises a port A and a port B; the valve element component comprises an upper valve element, a lower valve element and a compressed spring; the upper valve element is provided with a runner C and a runner D; a damping hole E is formed in the lower valve element; the runner C of the upper valve element communicates with the damping hole E of the lower valve element; the runner D of the upper valve element communicates with a runner F; and the lower valve element is contracted upwards, and when the bottom of the lower valve element is separated from a valve base, the runner F communicates with the port A of the valve body. The loader boom cylinder buffer valve and the control system thereof have the beneficial effects that requirement of rapid lifting and stable descending of a loader can be met; and operation stability of the loader, especially an extension-boom loader is improved.