The invention provides a boiler thermodynamic system. The boiler thermodynamic system comprises a central monitoring and diagnosis system and a plurality of boilers connected in parallel, wherein each boiler is in data connection with the central monitoring and diagnosis system; the central monitoring and diagnosis system is in data connection with a fuel conveying device of each boiler so as to conveniently obtain the fuel input amount of each boiler in time; and the central monitoring and diagnosis system is in data connection with the electricity use information of each boiler. The value of the ton steam electricity consumption SE is considered with the multiple boilers operating in parallel as a whole, the total ton steam electricity consumption SE of the boilers is defined as that the steam total mass S generated by all the boilers within a certain period is divided by the total auxiliary machine electricity consumption E input by all the boilers during the period, and the index of the total ton steam consumption fuel amount is obtained. That is, SE=S/E. By measuring the SE parameter of the boilers in real time, the parameters of each boiler when the SE reaches the maximum value can be obtained, and therefore the boilers connected in parallel can operate according to the above parameters in the operation process, and the SE reaches the maximum value. The thermodynamic system can keep operating efficiently all the time, and energy waste is avoided.