The invention discloses a temperature-control system of a walking type engineering machinery. The system comprises an engine water tank and a water pump; besides, the system also comprises a plurality of radiators, which are correspondingly arranged in a plurality of spaces in which temperatures are to be adjusted; in addition, the plurality of radiators, the engine water tank and the water pump are connected through pipelines to form a water supply loop. According to the invention, an influence on a working temperature of a sensing element in an alpine area can be effectively overcome; and an applicable range of environment of a walking type excavator is substantially improved on the basis that comfortableness of a driver in work is ensured. Preferably, the system also comprises: a system controller, which is configured to receive a control instruction or a feedback signal and output a plurality of control signals; and a direction control valve set, which is arranged in a water supply loop that is between the water pump and the radiators as well as is configured to response a selection signal among the plurality of signals of the system controller and to make commutation so as tomake a passage way between the water pump and the corresponding radiator be communicated. On the basis of the above-mentioned arrangement of the system, the invention also provides a walking type engineering machinery that applies the temperature-control system.