Constant temperature device for biological incubator

The utility model discloses a constant temperature device for a biological incubator, relates to the technical field of biological incubators, and aims to solve the problem that the temperature constant performance of the device is poor due to the fact that temperature fluctuation is easily caused when a bin door of an existing biological incubator is opened and closed. An upward turning door is arranged at the front end of the biological incubator shell, monitoring glass is arranged at the front end of the upward turning door, a door handle is arranged below the monitoring glass, a ventilation fan is arranged at the rear end of the biological incubator shell, and an electric heating table is arranged in the biological incubator shell. A porous constant-temperature table is arranged at the upper end of the electric heating table, an air inlet bin is arranged at the lower end of the electric heating table, a temperature adjusting fan is arranged at the input end of the air inlet bin, an air filtering pipe is a