The invention provides a manual tray 
carriage welding device, which comprises a base and an auxiliary installing base, wherein the base is in horizontal arrangement, the auxiliary installing base is positioned in the middle position of one side of the base and vertically and upwards extends, an x-direction positioning clamping module of a cargo fork of a manual tray 
carriage, a y-direction positioning clamping module of the cargo fork, a z-direction positioning clamping module of the cargo fork, a positioning clamping module of a top cover of the manual tray 
carriage and a positioning clamping module of a middle gear of the manual tray carriage, a positioning clamping module for a long shaft sleeve and a triangle of the manual tray carriage and a tooling mechanism of a back cover plate of the cargo fork are arranged on the base and the auxiliary installing base. The manual tray carriage 
welding device adopts the methods such as 
automation control technology, structural optimization design and space 
topology optimization for building the work procedure 
integration type manual tray carriage flexible 
welding device, the welding 
processing work procedures of the manual tray carriage are reduced, the 
processing site area is reduced, the production efficiency and the 
processing quality of the welding processing of the manual tray carriage are improved, the welding processing specifications of the manual tray carriage are increased, and the worker number and the work intensity are reduced.