Targeting the nonlinear impact of the friction pair's friction properties on the temperature field under the clutch braking condition, the convective heat transfer coefficient is calculated based on the assumption of equivalent thickness of the oil film in the gap, and the time-varying temperature field prediction model of the clutch is established through the differential equations of the temperature of the nodes of the friction pair and the continuity constraints of the thermal boundaries. The test results were compared with the theoretical results, and the correctness of the real-time temperature calculation model of the friction pair was verified. The results show that the friction coefficient decreases with the rise of the temperature and specific pressure of the friction pair, and the variation in the speed is consistent with the Stribeck curve. Under the braking condition, the temperature of the steel plate increases and then decreases with the sliding time, the higher the pressure, the shorter the braking sliding time. In the radius direction, the temperature of the radial distance is higher than that of the radial distance at the smaller position. Micro-elementary ring input heat flow tends to decrease approximately linearly with the slip time. The difference between the rotational speed change on the friction vice of the time-varying coefficient of friction has a greater impact on the friction, which in turn affects the temperature field.