A compression heat-generation detector and a method therefor include one set or multi-sets of detecting units. The detecting unit includes a vertical compression device, a vertical compensation device and a synchronization device for a core center temperature sensor. The vertical compression device and the vertical compensation device are respectively fixed in an upper frame. A pressure sensor is mounted between a middle support of the rubber sample and a supporting plate of the vertical compensation device via a first transition column. The synchronization device is mounted between the pressing plate of the vertical compression device and the supporting plate of the vertical compensation device via a second transition column and a cushion block. The transition column penetrates through a hole of the middle support without affecting accuracy of the pressure sensor in a compression stress test with respect to the rubber sample.