The invention provides a spindle motor installation structure of a vertical type carves-milling machine, belonging to the technical field of machine tools, for solving the problem that in the existing spindle motor mounting structures, the precision of all spindle motors can not be guaranteed easily. The spindle motor installation structure of the vertical type carves-milling machine comprises a strip-shaped cross beam, wherein motor mounting holes with the quantity equal to that of the spindle motors are formed in the cross beam, the spindle motors and the motor mounting holes are arranged in a one-to-one correspondence manner, the spindle motors are fixed in the motor mounting holes in the cross beam, the cross beam is fixed on the front side surface of a machine head through first fastening bolts, and adjusting bolts and a bolt horizontal adjustment mechanism capable of adjusting the horizontal state of the cross beam by rotating and screwing the adjusting bolts are arranged between the machine head and the cross beam. In the spindle motor installation structure, during the machining process of the cross beam, by controlling the machining precision, the requirements on parameters including the perpendicularity of the motor mounting holes, the center-to-center distances among the motor mounting holes, the parallelism among the motor mounting holes, and the like, are guaranteed, therefore, the consistency of the precision of all the spindle motors is significantly improved, and further, the machining precision of the carves-milling machine is greatly improved.