The invention provides a multifunctional cock which comprises a cock body, a pressure-tapping valve and a pressure relief valve. A pressure-tapping installing port connected with an external pipeline is arranged at the bottom of the cock body, and a pressure tapping and guiding channel communicated with the pressure-tapping installing port is arranged in the cock body, the pressure-tapping valve and the pressure relief valve are correspondingly installed on the left side and the right side of the cock body, an installing port of the pressure-tapping valve is communicated with the pressure tapping and guiding channel through a pressure-tapping valve connecting channel, and an installing port of the pressure relief valve is communicated with the pressure-tapping valve connecting channel through a pressure guiding channel. The upper portion of the cock body is provided with a double-face slope top structure, a pressure-tapping port is formed in each side slope top, two pressure-tapping ports are mutually communicated through an internal channel and are communicated with the pressure guiding channel through pressure-tapping channels. The multifunctional cock is further connected with a pressure guiding channel pressure relief port. The cock has the advantages of being convenient to produce, simple in structure, simple and convenient to maintain, convenient to install, flexible to operate, good in sealing performance, anticorrosion, not prone to damage, capable of saving space and the like.