Distribution valve for loader and hydraulic system of loader

The invention relates to a distribution valve for a loader and a hydraulic system of the loader, and aims to solve the problems that an existing quantitative hydraulic system of the loader cannot realize compound actions, large-flow high-pressure overflow loss can occur, and the driving force of a swing arm and the driving force of a rotating bucket are convergent. The invention provides the distribution valve and the hydraulic system for the loader. A PB3 oil port of the distribution valve is simultaneously connected with a first overflow valve and an oil inlet of a rotating bucket linkage control main valve, a middle position oil outlet of a swing arm linkage control main valve communicates with the PB3 oil port, and a PB4 oil port communicates with an oil inlet of the swing arm linkagecontrol main valve; a swing arm linkage load signal LS1 oil path is connected with a third overflow valve, a swing arm linkage load signal passes through a hydraulic switch valve, is compared with a rotating bucket linkage lo