The invention provides a mobile assembled combined cashbox comprising a box body, a theftproof lockset, and the like, wherein, the box body comprises a main cell box body and an assistant cell box body positioned on the lateral face of the main cell box body, the bottom of the assistant cell box body is provided with rolling wheels and a guideway, and the assistant cell box body can be moved along the guideway; and a locking dog of the theftproof lockset and the driving and operating units for the locking dog are installed on the main cell box body, a lock catch matched with the locking dog is installed on the assistant cell box body, and the main cell box body and the assistant cell box body are connected by locking the locking dog with the lock catch. The mobile assembled combined cashbox of the invention is not a fixed facility of a building, can be moved and flexibly arranged, and has large capacity and reliable theftproof performance.