The invention relates to a terahertz front-end integrated receiving device based on a bulk silicon MEMS (micro-electromechanical system) technical antenna, and the device is suitable for terahertz low-frequency stage and belongs to the technical field of terahertz. The device mainly comprises an antenna, a mixer chip, a base and a back panel, wherein the antenna comprises an H-face horn antenna based on a bulk silicon MEMS and a plane gradually changing type plantar slot antenna (ALTSA in short); the mixer chip is a superheterodyne detector and comprises a room temperature schottky diode mixer, a superconductivity tunnel junction mixer, and a hot electron bolometric resistance mixer; the external part of the base remains the position which is in physical match with the chip and an intermediate frequency terminal and the like; and the back panel also remains the space which is in physical match with the chip and the intermediate frequency terminal. According to the device, the antenna is processed through the bulk silicon MEMS technology; the processing precision of the terahertz device can be satisfied; and the device is convenient to manufacture and produce in mass, and is easy to assemble. Through the integral assembling method of the antenna, the mixer and a bias circuit, the success ratio of micro-packaging the components is improved, the integration level of the integral receiving device is improved; and the device has the advantages of small size, light weight and low cost.