The invention discloses an automatic hole marking device for a terminal connector. According to the device, positioning is accurate, operation is easy, and carrying is convenient; on the basis that workers are reduced, working time is shortened effectively, the project cost is reduced, and the project quality is improved; there is no need for too many workers to participate, the project progress is not influenced, and the project quality can be ensured. According to the technical scheme of the automatic hole marking device for the terminal connector, a terminal connector fixing base comprises a base body and a fixing clamp, and the fixing clamp is movably arranged on the base body and used for fixing the terminal connector; a vertical hole marking unit is arranged on the base body, an automatic size matcher is movably arranged on the vertical hole marking unit, and the vertical hole marking unit and the automatic size matcher are each provided with a driver; the corresponding driver drives the automatic size matcher to carry out size matching automatically, screw hole positioning marking is carried out on the terminal connector, and the drivers are electrically connected with a controller. The automatic hole marking device is widely applied to the technical field of terminal connectors.