Casting mold with mold locking function

The invention discloses a casting mold with a mold locking function. The casting mold comprises a first module and a second module which can be folded together up and down, the device is characterized in that the device comprises an extension arm extending from top to bottom, the upper portion of the extension arm is embedded in the first module, the lower portion of the extension arm is provided with a lock hole and extends to the position below the first module, and the second module is provided with an arm hiding channel capable of containing the lower portion of the extension arm and a transition channel. The transition channel and the arm hiding channel are communicated with each other and are approximately perpendicular to each other, and a locking column capable of moving back and forth in the transition channel is arranged on the second module; when the first module and the second module are in a folded state, the lower portion of the extension arm is inserted into the arm hiding channel, the lock hol