The invention belongs to the technical field of fire fighting apparatuses and in particular relates to a pitching slewing mechanism linked with horizontal slewing for a fire monitor. The pitching slewing mechanism is composed of a gun support, a lower bending pipe, an upper bending pipe, a horizontal slewing worm gear, a horizontal slewing worm, a pitching slewing worm gear and a pitching slewing worm. According to the pitching slewing mechanism linked with horizontal slewing for the fire monitor, a structure that the horizontal slewing of the fire monitor is linked with the pitching slewing is adopted to realize pitching slewing of the fire monitor, a phenomenon that the existing fire monitor realizes pitching slewing by utilizing the pitching slewing worm gear and the pitching slewing worm independently is changed, the quantity of elbows of the fire monitor is reduced, the hydraulic characteristic of an internal flow passage of the fire monitor is optimized, the injection performance of the fire monitor is improved and the structure of the fire monitor is relatively compact.