Abstract: In order to effectively solve the problems of deformation of the feeding supporting plate and gnawing damage of the guide rail for truck-mounted drilling rig, based on its working principle and mechanical characteristics, Abaqus software was used to carry out finite element analysis on the feed pallet of 60 t truck-mounted drilling rig, its failure reasons are theoretically analyzed, and the structure and material selection of the supporting plate are optimized accordingly. The support of the inclined support oil cylinder was shifted to both sides, the bottom plate rigidity of the support plate was strengthened by grid-shaped steel bars, Tri-Braze high-strength and wear-resisting steel was selected as the guide rail material of the support plate, and the contact plane of the guide rail was fully lubricated by lubricating oil injection holes and sawtooth oil storage tanks. The optimized feeding support plate structure is applied to the 100 t vehicle-mounted drilling rig, which has been verified by field test and achieved the expected effect.