The invention provides a hybrid power gearbox test rack applied in the hybrid power gearbox test equipment technology field. A hybrid power gearbox (6) is installed on a gearbox fixing seat (5) through a gearbox shell (7). An input dynamometer I (1) is connected to a differential mechanism (13). The differential mechanism (13) is connected to an input bearing seat (15). The input bearing seat (15)is connected to a gearbox input end I (8). An input dynamometer II (2) is connected to a speed increase box (18). The speed increase box (18) is connected to a gearbox input end II (9), a gearbox output end I (10) is connected to an output dynamometer I (3), and a gearbox output end II (11) is connected to the output dynamometer II (4). By using the hybrid power gearbox test rack, various performance tests can be conveniently and reliably performed on a hybrid power gearbox, which can realize free, fast and accurate switching of single input and double input states, and satisfy different testrequirements.