A detachable boiling point detector for brake fluid includes a holding portion and a detecting portion connected to the holding portion. The holding portion has a connecting portion, and an assembling end of the detecting portion is detachably connected to the connecting portion. The detecting portion has a heater and a temperature sensor which are connected to a first port. A first circuit board and a second circuit board are assembled in the holding portion and spaced by a distance. A second port is assembled on the second circuit board and facing the detecting portion. The first port is detachably combined with the second port. When the detecting portion is connected to the holding portion, the first port and the second port are combined with each other at a connection between the assembling end and the connecting portion.