The invention discloses a constant current driving circuit and a television. The constant current driving circuit comprises a power module and a power feedback module which are arranged on a power board, as well as a driving module arranged on a constant current board; alternating current mains supply is processed by the power module to generate first DC voltage for powering an LED light bar set and the first DC voltage is output to the power feedback module so as to enable the power feedback module to generate reference voltage and at the same time, the power module also generates second DC voltage for powering a main board; after the LED light bar set is powered, the driving module sends a voltage regulation signal to the power feedback module according to the sampling voltage of the LED light bar set, so as to change the value of the reference voltage generated by the power feedback module to change the value of the first DC voltage. In the invention, output voltage of a power supply is directly controlled through the constant current driving circuit, a constant current DC/DC circuit is omitted and the voltage is dynamically adjusted, so that the requirement of an LED on the voltage is met in real time while the space occupied by the constant current board is greatly reduced, and finally the efficiency is improved.