The invention provides a construction method for an inter-cooling tower integrated a chimney and a cooling tower, and belongs to the technical field of civil construction. The method includes the steps that modular unit plates for building the cone section and the straight cylinder section of the inter-cooling tower are assembled; the modular unit plates are used for building the cone section of the inter-cooling tower; the modular unit plates and a fixed tower crane are used for building the straight cylinder section of the inter-cooling tower on the cone section of the inter-cooling tower; the tower internal chimney is built inside the inter-cooling tower; in the process of building the straight cylinder section of the inter-cooling tower, a construction elevator is arranged inside the inter-cooling tower, and the construction elevator is attached to the fixed tower crane through a wall-attached frame; a horizontal channel is arranged between the fixed tower crane and the inner wallof the straight cylinder section of the built inter-cooling tower; and a tool type hanging basket is used for aerial operation. According to the construction method, a used construction machine is flexible, an operating platform is improved no longer dependent on the hydraulic pressure, the construction elevator and the tool type hanging basket are used for assisting to build the inter-cooling tower, thus the construction efficiency of the inter-cooling tower is improved, and the construction cost is lowered.