An uplink transmission power determining method, comprising: determining, by a user equipment, a transmission situation of at least one of: a physical uplink control channel, PUCCH, a physical uplink shared channel, PUSCH, and a sounding reference signal, SRS, on another cell except a secondary cell in a sub frame corresponding to a preamble to be transmitted on the secondary cell, wherein the transmission situation determined by the user equipment comprises that at least one of a PUCCH, a PUSCH and an SRS needs to be transmitted on another cell in a subframe except a first subframe among subframes corresponding to the preamble to be transmitted on the secondary cell, wherein that the at least one of a PUCCH, a PUSCH and an SRS needs to be transmitted on another cell in a subframe except a first subframe among subframes corresponding to the preamble to be transmitted on the secondary cell comprises that the PUCCH needs to be transmitted on the another cell in the subframe except the first subframe among the subframes corresponding to the preamble to be transmitted on the secondary cell; determining, by the user equipment, a transmission power of the preamble to be transmitted on the secondary cell and a transmission power of the PUCCH to be transmitted on the another cell, wherein a sum of the transmission power of the PUCCH and the transmission power of the preamble does not exceed a maximum allowable power and the transmission power of the PUCCH is a smaller one of a transmission power of the PUCCH obtained by the user equipment by performing uplink power control and a power difference, the power difference equal to the maximum allowable power minus the transmission power of the preamble, and wherein when also the PUSCH needs to be transmitted on the another cell in the subframe except the first subframe among the subframes corresponding to the preamble to be transmitted on the secondary cell, the transmission power of the PUSCH is determined as: ∑ w i ⋅ P PUSCH, c i ≤ P CMAX i − P PUCCH i − P PRACH i wherein w(i) represents a weighting factor, and its value range is [0, 1]; c represents a cell; ∑ w ( i)·P PUSCH,c ( i) represents the transmission power of the PUSCH; P PUCCH ( i) represents the transmission power of the PUCCH; P CMAX ( i) represents the maximum allowable power; and P PRACH ( i) represents the transmission power of the preamble; or as ∑ c ≠ j w i ⋅ P PUSCH, c i ≤ P CMAX i − P PUSCH, j i − P PUCCH i − P PRACH i. wherein P PUSCH,j represents a transmission power of a PUSCH of a cell j bearing uplink signaling. determining, by a user equipment, a transmission situation of at least one of: a physical uplink control channel, PUCCH, a physical uplink shared channel, PUSCH, and a sounding reference signal, SRS, on another cell except a secondary cell in a sub frame corresponding to a preamble to be transmitted on the secondary cell, wherein the transmission situation determined by the user equipment comprises that at least one of a PUCCH, a PUSCH and an SRS needs to be transmitted on another cell in a subframe except a first subframe among subframes corresponding to the preamble to be transmitted on the secondary cell, wherein that the at least one of a PUCCH, a PUSCH and an SRS needs to be transmitted on another cell in a subframe except a first subframe among subframes corresponding to the preamble to be transmitted on the secondary cell comprises that the PUCCH needs to be transmitted on the another cell in the subframe except the first subframe among the subframes corresponding to the preamble to be transmitted on the secondary cell; determining, by the user equipment, a transmission power of the preamble to be transmitted on the secondary cell and a transmission power of the PUCCH to be transmitted on the another cell, wherein a sum of the transmission power of the PUCCH and the transmission power of the preamble does not exceed a maximum allowable power and the transmission power of the PUCCH is a smaller one of a transmission power of the PUCCH obtained by the user equipment by performing uplink power control and a power difference, the power difference equal to the maximum allowable power minus the transmission power of the preamble, and wherein when also the PUSCH needs to be transmitted on the another cell in the subframe except the first subframe among the subframes corresponding to the preamble to be transmitted on the secondary cell, the transmission power of the PUSCH is determined as: ∑ w i ⋅ P PUSCH, c i ≤ P CMAX i − P PUCCH i − P PRACH i wherein w(i) represents a weighting factor, and its value range is [0, 1]; c represents a cell; ∑ w ( i)·P PUSCH,c ( i) represents the transmission power of the PUSCH; P PUCCH ( i) represents the transmission power of the PUCCH; P CMAX ( i) represents the maximum allowable power; and P PRACH ( i) represents the transmission power of the preamble; or as ∑ c ≠ j w i ⋅ P PUSCH, c i ≤ P CMAX i − P PUSCH, j i − P PUCCH i − P PRACH i. wherein P PUSCH,j represents a transmission power of a PUSCH of a cell j bearing uplink signaling.