Preventive handcart ground knife interlocking device

The invention relates to a preventive handcart ground knife interlocking device. The device comprises a shell, a grounding operation shaft and a grounding operation hole, a partition plate is fixedly arranged in the shell, an upper guide rail is fixedly arranged above the partition plate, an opening is formed in the upper guide rail, an interlocking plate is arranged on the partition plate, and the interlocking plate is rotationally connected to the partition plate through a rotating shaft extending in the front-back direction; the upper end part of the interlocking plate is provided with a pushing convex part which can be in a working state of stretching into the open hole or in an idle state of withdrawing from the open hole in the process of rotating around the rotating shaft; the device further comprises an opening and closing assembly, a synchronizing part, a locking assembly, an unlocking assembly, a maintaining assembly and an interlocking reset part. After the grounding switch is operated every time,