Most of existing commercial IoT devices do not collaborate with one another yet, and it is also challenging to develop intelligent care services (ICS) to satisfy user needs while minimizing user inconvenience due to multiple sources of changing contexts. In this study, we demonstrate our concept of IoT-based collaborative context reasoning in a setting of a smart kitchen environment, where a smart kitchen cabinet providing ICS is designed. We prototyped a smart kitchen stand deployed with sensors and actuators controlled by Intel Galileo boards. Based on a flexible M2M platform, i.e., WuKong, an IoT-based service application was composed. Results show that our system can correctly infer contexts through collaborative sensors and according to these contexts proactively react to enable/disable actuators to ensure kitchen safety or provide occupants convenience based on provided usage model of occupants.