The invention discloses a henhouse environmental temperature detection system based on a CAN field bus, which is characterized in that the environmental temperature detection system is composed of a henhouse environmental parameter acquisition platform based on the CAN field bus and a henhouse environment multipoint temperature fusion model. Thus, multiple problems existing in a sealed henhouse environment due to unreasonable design, poor equipment and an imperfect control system of the traditional henhouse environmental temperature monitoring system can be effectively solved, and the problem that detection and fusion on the temperature of the henhouse environment are not based on features such as nonlinear changes of the henhouse environmental temperature, large lag and complicated temperature changes in a large-area henhouse and thus regulation on the henhouse environmental temperature is greatly influenced in the existing henhouse environment monitoring system can also be effectively solved.