Speed changing box automatic gear shifting testing device

The invention discloses a speed changing box automatic gear shifting testing device. The speed changing box automatic gear shifting testing device comprises a portal frame, wherein a guide rail bottom plate is arranged on the portal frame, a linear guide rail module, an electrical control box and an electric cylinder are fixedly arranged on the guide rail bottom plate, a gear moving supporting plate device is arranged on the linear guide rail module, the gear moving supporting plate device is fixedly arranged on the linear guide rail module through a rotating clamping device, a telescopic sleeve is arranged below a guide support, the lower portion of the telescopic sleeve is arranged on a gear shifting ball head, a force sensor is fixedly connected with the lower portion of the gear shifting ball head, and a gear shifting tool is fixedly connected with the lower portion of the force sensor. By means of a gear shifting rod, a gear shifting rod separation air cylinder, a gear selection portion and gear moving portion splitting structure and a travel-adjustable air cylinder which are independently arranged and directly connected with one another, the problem that in the prior art, decoupling can not be well conducted on motion force through additional force which is exerted on the gear shifting rod by a mechanical arm is solved, meanwhile, interference caused by external devices is avoided in the measurement process, and measurement accuracy is greatly improved.