The invention relates to the technical field of automatic assembly fixtures, in particular to an automatic assembly fixture for a combined instrument liquid crystal. The automatic assembly fixture comprises a fixture box. The lower left corner and the lower right corner of an upper cover plate are each provided with a fixing column. Each fixing column is provided with an interlocking type button. A front panel is provided with a power indicator lamp, an OK indicator lamp and a rotary knob start switch. A left panel and a right panel are symmetrically provided with maintenance lock catches and carrying handles. The two carrying handles are located in the middles of the left panel and the right panel correspondingly. The automatic assembly fixture has the advantages that the structure is simple and attractive, operation and maintenance are convenient, the assembly quality is ensured, the production efficiency can be greatly improved, and manual assembly of the instrument liquid crystal is completely replaced. The automatic assembly fixture is mainly used for a tricyclic T3 combined instrument liquid crystal assembly working procedure, the liquid crystal is not likely to be fractured, stability is higher, long-time repeated work is not needed, the production efficiency is high, the liquid crystal fracture rejection rate is low, and the automatic assembly fixture is worthy of being used and popularized.