The invention provides an automatic filling system for waterproof coating production, and belongs to the technical field of waterproof coating filling systems. The automatic filling system comprises a system processing seat, a one-way driving lifting platform mechanism and a coating storage and filling mechanism are arranged on the system processing seat, a partially telescopic sliding block is slidably arranged in the system processing seat, the partially telescopic sliding block extends in the direction of a containing table, dual-purpose arc sections are connected to the outer portion of the system processing seat in a vertically symmetrical and sliding mode, and a conversion motion assembly is connected between the dual-purpose arc sections and a lead screw. According to the automatic filling system for waterproof coating production, through the combined action of the one-way driving lifting platform mechanism, a filling extension opening, the partially telescopic sliding block, the conversion motion assembly and a synchronous part, the diffusion rate of a coating and the probability of coating splashing are greatly reduced, and therefore, the pollution degree of the coating filling environment and the integrity of the coating quality are improved, the working energy consumption of the whole production system is relatively reduced, and meanwhile, high production precision can be kept.