Flattening device and test platform

The utility model provides a flattening device and a test platform, the flattening device comprises: a first support, a lifting mechanism and a flattening mechanism, the lifting mechanism is connected to the first support, the flattening mechanism is connected to the lifting mechanism in a liftable manner, the flattening mechanism is used for lifting under the driving of the lifting mechanism, and the first support is connected to the first support. And the pressing plate is pressed against the to-be-laminated piece so as to flatten the to-be-laminated piece. According to the utility model, in the process of carrying out electroluminescence detection on the to-be-laminated piece, the flattening mechanism is propped against the to-be-laminated piece, and the to-be-laminated piece is flattened by the gravity of the flattening mechanism, so that the problem of misjudgment of the sheet spacing caused by the reasons such as swelling of an adhesive film of the to-be-laminated piece, insufficient soldering of a batt