The invention relates to the technical field of auxiliary devices for display screen film coating, and particularly relates to an auxiliary fixing device for finished product film coating for machining and production for liquid crystal display screens. The auxiliary fixing device comprises a top plate, four groups of supports, a bottom plate and two groups of fixers, wherein the bottom plate comprises an upper plate body, a lower plate body, a rotary shaft, two groups of support columns and two groups of pulleys, a first placement groove is formed in the top end of the lower plate body, a first ball bearing and a first limit sheet are arranged in the first placement groove, and a first stop sheet is arranged at the top end of the first placement groove; each of the four groups of supportscomprises an insertion column and an insertion pipe, a rapidly-detached pipe clamp sleeves each insertion pipe, each rapidly-detached pipe clamp comprises a rapidly-detached handle, a rapidly-detachedrod, a handle seat and a rapidly-detached hoop, and a nut is arranged at the left end of each rapidly-detached rod; and each of the two groups of fixers comprises a fixed column, a press rod, an extrusion spring group and a press block, second placement grooves are formed in the left side and the right side of the top end of the top plate separately, second ball bearings and second limit sheets are arranged in the two groups of second placement grooves separately, and second stop sheets are arranged at the top ends of the two groups of second placement grooves separately.