The invention discloses a diversified energy economic scheduling optimization method for a combined cooling, heating and power system. Time interval-based electricity prices and combustion gas prices are input, operation costs under two operation modes are respectively calculated according to the time interval-based electricity prices and combustion gas prices, operation and maintenance costs of the two operation modes under the same capacity conditions are compared with each other, relative economic benefits are calculated, a combined supply system operation strategy table for different time intervals is made, a load prediction curve for recent days is provided, operation capacity of the combined supply system can be determined based on the combined supply system operation strategy table via an enumeration method, an optimal operation mode can be chosen according to the operation capacity of the combined supply system, and an economic scheduling optimization solution for the combined cooling, heating and power system for the recent days can be made and output. The method disclosed in the invention can be used for conveniently making economic and scientific operation strategies for the combined cooling, heating and power system; effectively assistance can be provided for making of scheduling plans for the combined cooling, heating and power system for recent days; overall utilization rates of energy can be improved via ladder type usage of energies of different qualities.