Abstract: α-zirconium phosphate (α-ZrP) as synergist was combined with piperazine-modified ammonium polyphosphate (Pa-APP)/pentaerythritol (PER) intumescent flame retardants to overcome the flammability and melt dropping issues of polyacrylate. The optimal addition ratio was explored through orthogonal experiments. The results show that Pa-APP/PER/α-ZrP has a prominent synergistic flame retardant effect with 25% total addition, Pa-APP:PER=9:2 and 2% α-ZrP, the maximal LOI of polyacrylate composite reached 30.4%, UL-94 achieved V-1, and the peak heat release rate (PHRR) and total heat release (THR) reduced by 75.9% and 39.4%, respectively. In addition, the morphology and composition of carbon residue were analyzed by scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) and fourier transform infrared spectrum (FT-IR),the system improved the weight and quality of carbon layer of polyacrylate, which effectively inhibited the droplet and smoke generation, significantly improved the fire safety of polycrylate.