The invention relates to the technical field of communications engineering, in particular to a waterproof circuit board. The conventional circuit boards are fixed in structure and single in function, and do not have assorted protection devices, so that the circuit boards are possible to be damaged due to dampness in the using process. The waterproof circuit board comprises a circuit board main body; one end of the circuit board main body is fixedly connected with an automatic wind-up roll; and a waterproof membrane is wound on the automatic wind-up roll. The waterproof circuit board is simple in structure, convenient to operate and stable and reliable in work; and through the waterproof membrane on the automatic wind-up roll, the circuit board main body can be effectively protected, so that the service life of the circuit board main body is prolonged.