Combined counter weight of crawler crane

The invention provides a combined counter weight of a crawler crane. The combined counter weight of the crawler crane comprises a first counter weight at the front side and a second counter weight at the rear side; the upper end surface of the first counter weight is provided with a first assembling groove; the left part and the right part of the bottom surface of the first assembling groove are respectively provided with a first fixing device; a second assembling groove is formed at the middle part of the front end surface of the second counter weight; the left part and the right part of the bottom surface of the second assembling groove are respectively provided with a second fixing device. A left support plate and a second support plate of an installation frame are utilized for being respectively matched with the first fixing devices, and the two first fixing devices are respectively connected with the left support plate and the second support plate through pin shafts; the left support plate and the right