Locking force testing device

The utility model discloses a locking force testing device which comprises a lower die base and a female die plate located above the lower die base, a female die is embedded in the female die plate, a through hole penetrating through the lower die base and the female die is formed in the female die, an insert is clamped in the through hole, a locking ring is arranged between the section, located on the lower die base, in the through hole and the insert, and the locking ring is connected with the lower die base. A fixing plate is arranged above the female die plate, a jack is arranged on the fixing plate, the output end of the jack is arranged downwards, an ejector block is arranged between the output end of the jack and the insert, a pressure sensor is arranged between the ejector block and the output end of the jack, and the ejector block abuts against the insert and applies pressure to the insert through the jack. Therefore, the locking force of the female die to the insert can be detected. According to the