The invention discloses a dry-mixed pretreatment cement mortar stirring device, and belongs to the technical field of constructional engineering. The dry-mixed pretreatment cement mortar stirring device comprises a base, the base further comprises a base frame, the base frame is located at the top end of the base and fixed to the side wall of the top end of the base, a stirring barrel is fixed to the inner side wall of the base frame, the side wall of the top end of the stirring barrel is rotationally connected with a rotating rod, and the outer side wall of the rotating rod is fixedly sleeved with stirring blades. Mud sand is screened and fed through a screening and discharging assembly, stones and cakes contained in the mud sand can be separated out, meanwhile, discharging can be conducted more quickly, blocking is not likely to happen, the quality of the dry-mixed mud sand is improved, the workload of stirring blades is reduced, the service life of the stirring device is prolonged, quantitative discharging is conducted on a discharging pipe through a quantitative discharging assembly, slow overflowing cannot be caused when a material collecting box conducts material collecting again, mud sand pouring waste is avoided, meanwhile, workers can conveniently conduct material collecting control according to construction requirements, the cost is saved, and the processing efficiency is improved.