The present invention relates to a multimode multi-frequency combined antenna and a GNSS receiver. The multimode multi-frequency combined antenna includes a first shielding cover, a GNSS radio frequency board, a GNSS antenna, a bracket, a network main antenna, a network diversity antenna, and two WIFI Bluetooth antennas. For the multimode multi-frequency combined antenna described above, an integrated design idea is used, an optimized design layout is reasonable, clearing of an antenna area is reasonable, network main antenna and diversity antenna are separated from each other, WIFI Bluetoothantennas are separated from each other and are diagonally placed, and a physical distance is increased. In this way, not only isolation is improved, but also phase center stability of the GNSS antennacan be ensured, and a phase error caused by geometric asymmetry of the GNSS antenna is reduced. In addition, a reasonable structural design can ensure effective reception and transmitting of satellite signals, network signals, and WIFI Bluetooth signals with high-precision. In addition, the network antenna is compatible with the main diversity antenna, and a signal received by the antenna in a position in which the spatial signal is stronger is fully utilized, a signal to noise ratio is higher, and signal transmission quality is better.